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java计算器源代码文件百度云(java软件百度云)

admin 发布:2022-12-19 19:02 140


本篇文章给大家谈谈java计算器源代码文件百度云,以及java软件百度云对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。

本文目录一览:

急求JAVA计算器源代码

//HTML

html

applet code=SZJSQ.class width=400 height=180

/applet

/html

//APPLET

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.applet.*;

public class SZJSQ extends JApplet implements ActionListener

{

boolean i=true;

private JButton num0=new JButton("0");

private JButton num1=new JButton("1");

private JButton num2=new JButton("2");

private JButton num3=new JButton("3");

private JButton num4=new JButton("4");

private JButton num5=new JButton("5");

private JButton num6=new JButton("6");

private JButton num7=new JButton("7");

private JButton num8=new JButton("8");

private JButton num9=new JButton("9");

private JButton zuok=new JButton("(");

private JButton youk=new JButton(")");

private JButton dian=new JButton(".");

private JButton NULL=new JButton("N");

private JButton plu=new JButton("+");

private JButton min=new JButton("-");

private JButton mul=new JButton("x");

private JButton div=new JButton("/");

private JButton equ=new JButton("=");

private JButton cle=new JButton("C");//清除

private JTextField space=new JTextField(30);

public void init()

{

JPanel text=new JPanel();

text.setLayout(new FlowLayout());

text.add(space);

JPanel buttons=new JPanel();

buttons.setLayout(new GridLayout(5,4));

buttons.add(num9);

buttons.add(num8);

buttons.add(num7);

buttons.add(plu);

buttons.add(num6);

buttons.add(num5);

buttons.add(num4);

buttons.add(min);

buttons.add(num3);

buttons.add(num2);

buttons.add(num1);

buttons.add(mul);

buttons.add(num0);

buttons.add(cle);

buttons.add(equ);

buttons.add(div);

buttons.add(zuok);

buttons.add(youk);

buttons.add(dian);

buttons.add(NULL);

(num9).addActionListener(this);

(num8).addActionListener(this);

(num7).addActionListener(this);

(num6).addActionListener(this);

(num5).addActionListener(this);

(num4).addActionListener(this);

(num3).addActionListener(this);

(num2).addActionListener(this);

(num1).addActionListener(this);

(num0).addActionListener(this);

(plu).addActionListener(this);

(min).addActionListener(this);

(mul).addActionListener(this);

(div).addActionListener(this);

(equ).addActionListener(this);

(cle).addActionListener(this);

(zuok).addActionListener(this);

(youk).addActionListener(this);

(dian).addActionListener(this);

setLayout(new BorderLayout());

add("North",text);

add("South",buttons);

space.setText("0");

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==num9)

{

if(i==true)

{

space.setText("9");

i=false;

}

else space.setText(space.getText()+'9');

}

if(e.getSource()==num8)

{

if(i==true)

{

space.setText("8");

i=false;

}

else space.setText(space.getText()+'8');

}

if(e.getSource()==num7)

{

if(i==true)

{

space.setText("7");

i=false;

}

else space.setText(space.getText()+'7');

}

if(e.getSource()==num6)

{

if(i==true)

{

space.setText("6");

i=false;

}

else space.setText(space.getText()+'6');

}

if(e.getSource()==num5)

{

if(i==true)

{

space.setText("5");

i=false;

}

else space.setText(space.getText()+'5');

}

if(e.getSource()==num4)

{

if(i==true)

{

space.setText("4");

i=false;

}

else space.setText(space.getText()+'4');

}

if(e.getSource()==num3)

{

if(i==true)

{

space.setText("3");

i=false;

}

else space.setText(space.getText()+'3');

}

if(e.getSource()==num2)

{

if(i==true)

{

space.setText("2");

i=false;

}

else space.setText(space.getText()+'2');

}

if(e.getSource()==num1)

{

if(i==true)

{

space.setText("1");

i=false;

}

else space.setText(space.getText()+'1');

}

if(e.getSource()==num0)

{

if(i==true)

{

space.setText("0");

i=false;

}

else space.setText(space.getText()+'0');

}

if(e.getSource()==zuok)

{

if(i==true)

{

space.setText("(");

i=false;

}

else space.setText(space.getText()+'(');

} if(e.getSource()==youk)

{

if(i==false)

space.setText(space.getText()+')');

}

if(e.getSource()==dian)

{

if(i==false)

space.setText(space.getText()+'.');

}

if(e.getSource()==plu)

{

space.setText(space.getText()+'+');

i=false;

}

if(e.getSource()==min)

{

space.setText(space.getText()+'-');

i=false;

}

if(e.getSource()==mul)

{

space.setText(space.getText()+'*');

i=false;

}

if(e.getSource()==div)

{

space.setText(space.getText()+'/');

i=false;

}

if(e.getSource()==equ)

{

space.setText(String.valueOf(Calculator(space.getText())));

i=true;

}

if(e.getSource()==cle)

{

space.setText("0");

i=true;

}

}

public double Calculator(String f)//科学计算

{

int i=0,j=0,k;

char c;

StringBuffer s=new StringBuffer();

s.append(f);

s.append('=');

String formula=s.toString();

char[] anArray;

anArray=new char[50];

StackCharacter mystack=new StackCharacter();

while(formula.charAt(i)!='=')

{

c=formula.charAt(i);

switch(c)

{

case '(': mystack.push(new Character(c));

i++;

break;

case ')':

while(mystack.peek().charValue()!='(')

{

anArray[j++]=mystack.pop().charValue();

}

mystack.pop();

i++;

break;

case '+':

case '-':

while(!mystack.empty()mystack.peek().charValue()!='(')

{

anArray[j++]=mystack.pop().charValue();

}

mystack.push(new Character(c));

i++;

break;

case '*':

case '/':

while(!mystack.empty()(mystack.peek().charValue()=='*'||mystack.peek().charValue()=='/'))

{

anArray[j++]=mystack.pop().charValue();

}

mystack.push(new Character(c));

i++;

break;

case' ': i++;

break;

default: while((c='0'c='9')||c=='.')

{

anArray[j++]=c;

i++;

c=formula.charAt(i);

}

anArray[j++]='#';

break;

}

}

while(!(mystack.empty()))

anArray[j++]=mystack.pop().charValue();

i=0;

int count;

double a,b,d;

StackDouble mystack1 =new StackDouble();

while(ij)

{

c=anArray[i];

switch(c)

{

case '+':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b+a;

mystack1.push(new Double(d));

i++;

break;

case '-':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b-a;

mystack1.push(new Double(d));

i++;

break;

case '*':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b*a;

mystack1.push(new Double(d));

i++;

break;

case '/':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

if(a!=0)

{

d=b/a;

mystack1.push(new Double(d));

i++;

}

else

{

System.out.println("Error!");

}

break;

default:

d=0;count=0;

while((c='0'c='9'))

{

d=10*d+c-'0';

i++;

c=anArray[i];

}

if(c=='.')

{

i++;

c=anArray[i];

while((c='0'c='9'))

{

count++;

d=d+(c-'0')/Math.pow(10,count);

i++;

c=anArray[i];

}

}

if(c=='#')

mystack1.push(new Double(d));

i++;

break;

}

}

return(mystack1.peek().doubleValue());

}

}

要用java编的计算器代码

给你一个比较简单的吧。以前写的。

共两个类。还只是完成+、-、×、÷运算而已。

GUI只是用了AWT,很简单,相信一看就能懂了。

Calculator.java

public class Calculator{

private String result = "0";

private int op = 0,add = 1,sub = 2,mul = 3,div = 4;

private double stringToDouble(String x){

double y = Double.parseDouble(x);

return y;

}

private void operate(String x){

double x1 = stringToDouble(x);

double y = stringToDouble(result);

switch (op){

case 0:

result = x;

break;

case 1:

result = String.valueOf(y+x1);

break;

case 2:

result = String.valueOf(y-x1);

break;

case 3:

result = String.valueOf(y*x1);

break;

case 4:

if(x1!=0){

result = String.valueOf(y/x1);

}else{

result = "The divisor can't be zero!";

}

break;

}

}

public String opAdd(String x){

operate(x);

op = add;

return result;

}

public String opSubtract(String x){

operate(x);

op = sub;

return result;

}

public String opMultiply(String x){

operate(x);

op = mul;

return result;

}

public String opDivide(String x){

operate(x);

op = div;

return result;

}

public String opEquals(String x){

operate(x);

op = 0;

return result;

}

public void opClean(){

op = 0;

result = "0";

}

}

CalculatorGUI.java

import java.awt.*;

import java.awt.event.*;

import java.util.EventObject;

public class CalculatorGUI{

private Frame f;

private Panel p1,p2;

private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;

private Button bPoint,bAdd,bDec,bMul,bDiv,bCal;

private TextField tf;

private String s,op;

private Calculator cal = new Calculator();

private boolean ifOp;

public CalculatorGUI(){

f = new Frame("Calculator");

p1 = new Panel();

p2 = new Panel();

b0 = new Button("0");

b1 = new Button("1");

b2 = new Button("2");

b3 = new Button("3");

b4 = new Button("4");

b5 = new Button("5");

b6 = new Button("6");

b7 = new Button("7");

b8 = new Button("8");

b9 = new Button("9");

bPoint = new Button(".");

bAdd = new Button("+");

bDec = new Button("-");

bMul = new Button("*");

bDiv = new Button("/");

bCal = new Button("=");

tf = new TextField(25);

tf.setEditable(false);

}

public void launchFrame(){

f.setSize(220,160);

f.setResizable(false);

f.addWindowListener(new myWindowListener());

p1.setLayout(new FlowLayout(FlowLayout.CENTER));

p1.add(tf);

f.add(p1,BorderLayout.NORTH);

p2.setLayout(new GridLayout(4,4));

b0.addActionListener(new setLabelText_ActionListener());

b1.addActionListener(new setLabelText_ActionListener());

b2.addActionListener(new setLabelText_ActionListener());

b3.addActionListener(new setLabelText_ActionListener());

b4.addActionListener(new setLabelText_ActionListener());

b5.addActionListener(new setLabelText_ActionListener());

b6.addActionListener(new setLabelText_ActionListener());

b7.addActionListener(new setLabelText_ActionListener());

b8.addActionListener(new setLabelText_ActionListener());

b9.addActionListener(new setLabelText_ActionListener());

bPoint.addActionListener(new setLabelText_ActionListener());

bAdd.addActionListener(new setOperator_ActionListener());

bDec.addActionListener(new setOperator_ActionListener());

bMul.addActionListener(new setOperator_ActionListener());

bDiv.addActionListener(new setOperator_ActionListener());

bCal.addActionListener(new setOperator_ActionListener());

p2.add(b7);

p2.add(b8);

p2.add(b9);

p2.add(bAdd);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.add(bDec);

p2.add(b1);

p2.add(b2);

p2.add(b3);

p2.add(bMul);

p2.add(b0);

p2.add(bPoint);

p2.add(bCal);

p2.add(bDiv);

f.add(p2,BorderLayout.SOUTH);

f.setVisible(true);

}

public void setTextFieldText_Temp(){

if (tf.getText().length()15 (tf.getText().indexOf(".")==-1 || !s.equals("."))){

tf.setText(tf.getText()+s);

}else{

tf.setText((tf.getText()+s).substring(0,15));

}

}

public void setTextFieldText(){

if(ifOp){

ifOp = false;

tf.setText("");

setTextFieldText_Temp();

}else{

setTextFieldText_Temp();

}

}

public static void main(String[] args){

CalculatorGUI calculator = new CalculatorGUI();

calculator.launchFrame();

}

class myWindowListener extends WindowAdapter{

public void windowClosing(WindowEvent e){

System.exit(0);

}

}

class setLabelText_ActionListener implements ActionListener{

public void actionPerformed(ActionEvent e){

Button tempB = (Button)e.getSource();

s = tempB.getLabel();

setTextFieldText();

}

}

class setOperator_ActionListener implements ActionListener{

public void actionPerformed(ActionEvent e){

Button tempB = (Button)e.getSource();

op = tempB.getLabel();

if(op.equals("+")){

tf.setText(cal.opAdd(tf.getText()));

ifOp = true;

}else if(op.equals("-")){

tf.setText(cal.opSubtract(tf.getText()));

ifOp = true;

}else if(op.equals("*")){

tf.setText(cal.opMultiply(tf.getText()));

ifOp = true;

}else if(op.equals("/")){

tf.setText(cal.opDivide(tf.getText()));

ifOp = true;

}else if(op.equals("=")){

tf.setText(cal.opEquals(tf.getText()));

ifOp = true;

}

}

}

}

求个Java计算器源代码,要正确的!可以加分

我们刚好测试完 呵呵 import java.awt.BorderLayout; import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JTextArea; public class Calculater extends JFrame implements ActionListener{ JTextArea jta; JMenuBar menubar; JMenu menu; JMenuItem menuItem; JButton b0;JButton b1;JButton b2;JButton b3;JButton b4;JButton b5;JButton b6;JButton b7;JButton b8;JButton b9; JButton bAdd;JButton bMinus;JButton bMuliply;JButton bDivide;JButton bEqual;JLabel label;JButton bSQRT;JButton bClear; JButton bON;JButton bOFF;JMenuItem jHelp; String op1="",op2=""; String operation = "";//用来存储+,-,*,/操作 public Calculater(){ super("计算器"); init(); } void init(){ JMenuBar menuBar=new JMenuBar(); setJMenuBar(menuBar); menu=new JMenu("Help"); menuBar.add(menu); jHelp = new JMenuItem("帮助",new ImageIcon("image/help.gif")); menu.add(jHelp); jta = new JTextArea(1,16); Container contentPane=getContentPane(); contentPane.setLayout(new FlowLayout()); label = new JLabel(new ImageIcon("image/label.gif")); b0 =new JButton("0"); b1 =new JButton("1"); b2 =new JButton("2"); b3 =new JButton("3"); b4 =new JButton("4"); b5 =new JButton("5"); b6 =new JButton("6"); b7 =new JButton("7"); b8 =new JButton("8"); b9 =new JButton("9"); bAdd =new JButton("+"); bMinus =new JButton("-"); bMuliply =new JButton("*"); bDivide =new JButton("/"); bEqual =new JButton("="); bClear =new JButton("Clear"); (b0).addActionListener(this); (b1).addActionListener(this); (b2).addActionListener(this); (b3).addActionListener(this); (b4).addActionListener(this); (b5).addActionListener(this); (b6).addActionListener(this); (b7).addActionListener(this); (b8).addActionListener(this); (b9).addActionListener(this); (bAdd).addActionListener(this); (bMinus).addActionListener(this); (bMuliply).addActionListener(this); (bDivide).addActionListener(this); (bEqual).addActionListener(this); (bClear).addActionListener(this); (jHelp).addActionListener(this); contentPane.add(label); contentPane.add(jta); contentPane.add(b1); contentPane.add(b2); contentPane.add(b3); contentPane.add(b4); contentPane.add(b5); contentPane.add(b6); contentPane.add(b7); contentPane.add(b8); contentPane.add(b9); contentPane.add(b0); contentPane.add(bAdd); contentPane.add(bMinus); contentPane.add(bMuliply); contentPane.add(bDivide); contentPane.add(bEqual); contentPane.add(bClear); } public void actionPerformed(ActionEvent e) { if(e.getSource()==jHelp) { JDialog dialog = new JDialog(this,"****** 版权所有 *****"); dialog.setSize(250, 100); dialog.setLocation(450, 250); JLabel text = new JLabel("本计算器由 所著..."); dialog.setLayout(new BorderLayout()); dialog.add(text,"Center"); dialog.setVisible(true); } if(e.getSource()==b0) { jta.setText(jta.getText()+"0"); } if(e.getSource()==b1) { jta.setText(jta.getText()+"1"); } if(e.getSource()==b2) { jta.setText(jta.getText()+"2"); } if(e.getSource()==b3) { jta.setText(jta.getText()+'3'); } if(e.getSource()==b4) { jta.setText(jta.getText()+'4'); } if(e.getSource()==b5) { jta.setText(jta.getText()+'5'); } if(e.getSource()==b6) { jta.setText(jta.getText()+'6'); } if(e.getSource()==b7) { jta.setText(jta.getText()+'7'); } if(e.getSource()==b8) { jta.setText(jta.getText()+'8'); } if(e.getSource()==b9) { jta.setText(jta.getText()+'9'); } if(e.getSource()==bAdd) { op1 = jta.getText(); operation = "+"; jta.setText(""); label.setText("Add"); bAdd.setEnabled(false); } if(e.getSource()==bClear) { op1 = ""; operation = ""; op2 = ""; jta.setText(""); label.setText("清空"); } if(e.getSource()==bMinus) { op1 = jta.getText(); operation = "-"; jta.setText(""); label.setText("Minus"); bMinus.setEnabled(false); } if(e.getSource()==bMuliply) { op1 = jta.getText(); operation = "*"; jta.setText(""); label.setText("Muliply"); bMuliply.setEnabled(false); } if(e.getSource()==bDivide) { op1 = jta.getText(); operation = "/"; jta.setText(""); label.setText("Divide"); bDivide.setEnabled(false); } if(e.getSource()==bEqual) { bAdd.setEnabled(true); bMinus.setEnabled(true); bMuliply.setEnabled(true); bDivide.setEnabled(true); double p1=0,p2=0,result=0; op2 = jta.getText(); if(operation.equals("+")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1+p2; label.setText("和="); jta.setText(new Double(result).toString()); } if(operation.equals("-")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1-p2; label.setText("差="); jta.setText(new Double(result).toString()); } if(operation.equals("*")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1*p2; label.setText("积="); jta.setText(new Double(result).toString()); } if(operation.equals("/")) { p1 = Double.parseDouble(op1); p2 = Double.parseDouble(op2); result = p1/p2; label.setText("商="); jta.setText(new Double(result).toString()); } } } public static void main(String args[]){ Calculater c=new Calculater(); c.setLocation(400, 200); c.setSize(250,260); c.setVisible(true); } }

java计算器的源代码

import java.awt.*;

import java.awt.event.*;

import java.lang.*;

import javax.swing.*;

public class Counter extends Frame

{

//声明三个面板的布局

GridLayout gl1,gl2,gl3;

Panel p0,p1,p2,p3;

JTextField tf1;

TextField tf2;

Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;

StringBuffer str;//显示屏所显示的字符串

double x,y;//x和y都是运算数

int z;//Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"

static double m;//记忆的数字

public Counter()

{

gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局

gl2=new GridLayout(4,1,0,15);

gl3=new GridLayout(4,5,10,15);

tf1=new JTextField(27);//显示屏

tf1.setHorizontalAlignment(JTextField.RIGHT);

tf1.setEnabled(false);

tf1.setText("0");

tf2=new TextField(10);//显示记忆的索引值

tf2.setEditable(false);

//实例化所有按钮、设置其前景色并注册监听器

b0=new Button("Backspace");

b0.setForeground(Color.red);

b0.addActionListener(new Bt());

b1=new Button("CE");

b1.setForeground(Color.red);

b1.addActionListener(new Bt());

b2=new Button("C");

b2.setForeground(Color.red);

b2.addActionListener(new Bt());

b3=new Button("MC");

b3.setForeground(Color.red);

b3.addActionListener(new Bt());

b4=new Button("MR");

b4.setForeground(Color.red);

b4.addActionListener(new Bt());

b5=new Button("MS");

b5.setForeground(Color.red);

b5.addActionListener(new Bt());

b6=new Button("M+");

b6.setForeground(Color.red);

b6.addActionListener(new Bt());

b7=new Button("7");

b7.setForeground(Color.blue);

b7.addActionListener(new Bt());

b8=new Button("8");

b8.setForeground(Color.blue);

b8.addActionListener(new Bt());

b9=new Button("9");

b9.setForeground(Color.blue);

b9.addActionListener(new Bt());

b10=new Button("/");

b10.setForeground(Color.red);

b10.addActionListener(new Bt());

b11=new Button("sqrt");

b11.setForeground(Color.blue);

b11.addActionListener(new Bt());

b12=new Button("4");

b12.setForeground(Color.blue);

b12.addActionListener(new Bt());

b13=new Button("5");

b13.setForeground(Color.blue);

b13.addActionListener(new Bt());

b14=new Button("6");

b14.setForeground(Color.blue);

b14.addActionListener(new Bt());

b15=new Button("*");

b15.setForeground(Color.red);

b15.addActionListener(new Bt());

b16=new Button("%");

b16.setForeground(Color.blue);

b16.addActionListener(new Bt());

b17=new Button("1");

b17.setForeground(Color.blue);

b17.addActionListener(new Bt());

b18=new Button("2");

b18.setForeground(Color.blue);

b18.addActionListener(new Bt());

b19=new Button("3");

b19.setForeground(Color.blue);

b19.addActionListener(new Bt());

b20=new Button("-");

b20.setForeground(Color.red);

b20.addActionListener(new Bt());

b21=new Button("1/X");

b21.setForeground(Color.blue);

b21.addActionListener(new Bt());

b22=new Button("0");

b22.setForeground(Color.blue);

b22.addActionListener(new Bt());

b23=new Button("+/-");

b23.setForeground(Color.blue);

b23.addActionListener(new Bt());

b24=new Button(".");

b24.setForeground(Color.blue);

b24.addActionListener(new Bt());

b25=new Button("+");

b25.setForeground(Color.red);

b25.addActionListener(new Bt());

b26=new Button("=");

b26.setForeground(Color.red);

b26.addActionListener(new Bt());

//实例化四个面板

p0=new Panel();

p1=new Panel();

p2=new Panel();

p3=new Panel();

//创建一个空字符串缓冲区

str=new StringBuffer();

//添加面板p0中的组件和设置其在框架中的位置和大小

p0.add(tf1);

p0.setBounds(10,25,300,40);

//添加面板p1中的组件和设置其在框架中的位置和大小

p1.setLayout(gl1);

p1.add(tf2);

p1.add(b0);

p1.add(b1);

p1.add(b2);

p1.setBounds(10,65,300,25);

//添加面板p2中的组件并设置其的框架中的位置和大小

p2.setLayout(gl2);

p2.add(b3);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.setBounds(10,110,40,150);

//添加面板p3中的组件并设置其在框架中的位置和大小

p3.setLayout(gl3);//设置p3的布局

p3.add(b7);

p3.add(b8);

p3.add(b9);

p3.add(b10);

p3.add(b11);

p3.add(b12);

p3.add(b13);

p3.add(b14);

p3.add(b15);

p3.add(b16);

p3.add(b17);

p3.add(b18);

p3.add(b19);

p3.add(b20);

p3.add(b21);

p3.add(b22);

p3.add(b23);

p3.add(b24);

p3.add(b25);

p3.add(b26);

p3.setBounds(60,110,250,150);

//设置框架中的布局为空布局并添加4个面板

setLayout(null);

add(p0);

add(p1);

add(p2);

add(p3);

setResizable(false);//禁止调整框架的大小

//匿名类关闭窗口

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e1)

{

System.exit(0);

}

});

setBackground(Color.lightGray);

setBounds(100,100,320,280);

setVisible(true);

}

//构造监听器

class Bt implements ActionListener

{

public void actionPerformed(ActionEvent e2)

{

try{

if(e2.getSource()==b1)//选择"CE"清零

{

tf1.setText("0");//把显示屏清零

str.setLength(0);//清空字符串缓冲区以准备接收新的输入运算数

}

else if(e2.getSource()==b2)//选择"C"清零

{

tf1.setText("0");//把显示屏清零

str.setLength(0);

}

else if(e2.getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText(""+(-x));

}

else if(e2.getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);//清空缓冲区以便接收新的另一个运算数

y=0d;

z=0;

}

else if(e2.getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=1;

}

else if(e2.getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=2;

}

else if(e2.getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=3;

}

else if(e2.getSource()==b26)//单击等号按钮输出计算结果

{

str.setLength(0);

switch(z)

{

case 0 : tf1.setText(""+(x+y));break;

case 1 : tf1.setText(""+(x-y));break;

case 2 : tf1.setText(""+(x*y));break;

case 3 : tf1.setText(""+(x/y));break;

}

}

else if(e2.getSource()==b24)//单击"."按钮输入小数

{

if(tf1.getText().trim().indexOf(′.′)!=-1)//判断字符串中是否已经包含了小数点

{

}

else//如果没数点有小

{

if(tf1.getText().trim().equals("0"))//如果初时显示为0

{

str.setLength(0);

tf1.setText((str.append("0"+e2.getActionCommand())).toString());

}

else if(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作

{

}

else

{

tf1.setText(str.append(e2.getActionCommand()).toString());

}

}

y=0d;

}

else if(e2.getSource()==b11)//求平方根

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText("数字格式异常");

if(x0)

tf1.setText("负数没有平方根");

else

tf1.setText(""+Math.sqrt(x));

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b16)//单击了"%"按钮

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText(""+(0.01*x));

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b21)//单击了"1/X"按钮

{

x=Double.parseDouble(tf1.getText().trim());

if(x==0)

{

tf1.setText("除数不能为零");

}

else

{

tf1.setText(""+(1/x));

}

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b3)//MC为清除内存

{

m=0d;

tf2.setText("");

str.setLength(0);

}

else if(e2.getSource()==b4)//MR为重新调用存储的数据

{

if(tf2.getText().trim()!="")//有记忆数字

{

tf1.setText(""+m);

}

}

else if(e2.getSource()==b5)//MS为存储显示的数据

{

m=Double.parseDouble(tf1.getText().trim());

tf2.setText("M");

tf1.setText("0");

str.setLength(0);

}

else if(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR

{

m=m+Double.parseDouble(tf1.getText().trim());

}

else//选择的是其他的按钮

{

if(e2.getSource()==b22)//如果选择的是"0"这个数字键

{

if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作

{

}

else

{

tf1.setText(str.append(e2.getActionCommand()).toString());

y=Double.parseDouble(tf1.getText().trim());

}

}

else if(e2.getSource()==b0)//选择的是“BackSpace”按钮

{

if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零

{

if(str.length()!=1)

{

tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常

}

else

{

tf1.setText("0");

str.setLength(0);

}

}

y=Double.parseDouble(tf1.getText().trim());

}

else//其他的数字键

{

tf1.setText(str.append(e2.getActionCommand()).toString());

y=Double.parseDouble(tf1.getText().trim());

}

}

}

catch(NumberFormatException e){

tf1.setText("数字格式异常");

}

catch(StringIndexOutOfBoundsException e){

tf1.setText("字符串索引越界");

}

}

}

public static void main(String args[])

{

new Counter();

计算器java代码

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.WindowConstants;

import javax.swing.border.LineBorder;

class Normal{

double i,j;

public Normal(double num1,double num2){

i=num1;

j=num2;

}

public double puls(){

return i+j;

}

public double subtract(){

return i-j;

}

public double multiply(){

return i*j;

}

public double divide(){

return i/j;

}

public double surpuls(){

return i%j;

}

}

class scientific extends Normal{

public scientific(int num1, int num2) {

super(num1, num2);

}

}

public class calc extends JFrame{

public static void main(String[] args) {

viewNormal VN= new viewNormal("normal");

}

}

class viewNormal extends JFrame implements ActionListener{

JPanel jp1 = new JPanel(new GridLayout(4,3,5,5));

JPanel jp2 = new JPanel(new GridLayout(5,1,5,5));

JLabel jl;

JButton[] jb;

JButton jbs,jbo,jba,jbb,jbc,jby;

StringBuffer sb = new StringBuffer();

Normal normal;

int dot=0;

double fnum=0;

double lnum=0;

double result;

String sign=null;

public viewNormal(String title){

setTitle(title);

setLayout(null);

setVisible(true);

setBounds(200,200,305,350);

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

jb= new JButton[12];

for(int i=0;i9;i++){

jb[i]=new JButton(""+(i+1));

jp1.add(jb[i]);

jb[i].addActionListener(this);

}

jb[9]=new JButton(".");

jb[10]=new JButton("0");

jb[11]=new JButton("=");

jb[9].addActionListener(this);

jb[10].addActionListener(this);

jb[11].addActionListener(this);

jp1.add(jb[9]);

jp1.add(jb[10]);

jp1.add(jb[11]);

jp1.setBounds(10, 100, 200, 200);

jbs= new JButton("+");jbo= new JButton("-");jba= new JButton("*");

jbb= new JButton("/");jby= new JButton("%");jbc= new JButton("C");

jbs.addActionListener(this);jbo.addActionListener(this);jba.addActionListener(this);

jbb.addActionListener(this);jby.addActionListener(this);jbc.addActionListener(this);

//jp2.add(jby);

jp2.add(jbs);jp2.add(jbo);jp2.add(jba);jp2.add(jbb);jp2.add(jbc);

jp2.setBounds(215, 100, 70, 200);

jl= new JLabel("0",JLabel.RIGHT);

jl.setFont(new Font("Batang",Font.BOLD, 20));

jl.setBorder(new LineBorder(Color.black,2));

jl.setBackground(Color.white);

jl.setBounds(10, 40, 275, 50);

jl.setOpaque(true);

add(jl);

add(jp1);

add(jp2);

}

//+

public void sum(){

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.puls();

result=fnum;

}

//-

private void sub() {

System.out.println(sb.toString());

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.subtract();

result=fnum;

}

//*

private void mul() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.multiply();

result=fnum;

}

// /

private void div() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.divide();

result=fnum;

}

//%

private void sur() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.surpuls();

result=fnum;

}

// =

private void same(){

if(sign.equals("+")){

sum();

}

if(sign.equals("-")){

sub();

}

if(sign.equals("*")){

mul();

}

if(sign.equals("/")){

div();

}

if(sign.equals("%")){

sur();

}

}

//result

public void Result(){

if(result%1!=0)

jl.setText(""+result);

else

{

int i=(int)result;

jl.setText(""+i);

}

}

@Override

public void actionPerformed(ActionEvent e) {

//System.out.println(sb.toString());

// 1~9

for(int i=0;i9;i++){

if(e.getSource()==jb[i]!sb.toString().equals("0")){

sb.append(jb[i].getText());

jl.setText(sb.toString());

}

else if(e.getSource()==jb[i]sb.toString().equals("0")){

int d=sb.length();

sb.delete(0, d);

sb.append(jb[i].getText());

jl.setText(sb.toString());

}

}

// 0

if(e.getSource()==jb[10]!sb.toString().equals("0")){

sb.append(jb[10].getText());

jl.setText(sb.toString());

}

// .

if(e.getSource()==jb[9]dot==0!sb.toString().equals("")){

dot++;

sb.append(jb[9].getText());

jl.setText(sb.toString());

}

// =

if(e.getSource()==jb[11]!sb.toString().equals("")){

same();

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

// +

if(e.getSource()==jbs!sb.toString().equals("")){

if(sign!="+"sign!=null)

same();

else

sum();

sign ="+";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//-

if(e.getSource()==jbo!sb.toString().equals("")){

if(fnum==0)

fnum=2*Double.parseDouble(sb.toString());

if(sign!="-"sign!=null)

same();

else

sub();

sign ="-";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//*

if(e.getSource()==jba!sb.toString().equals("")){

if(fnum==0)

fnum=1;

if(sign!="*"sign!=null)

same();

else

mul();

sign ="*";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

// /

if(e.getSource()==jbb!sb.toString().equals("")){

if(fnum==0)

fnum=Math.pow(Double.parseDouble(sb.toString()),2);

if(sign!="/"sign!=null)

same();

else

div();

sign ="/";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//%

// if(e.getSource()==jby!sb.toString().equals("")){

// if(fnum==0){

// fnum=Double.parseDouble(sb.toString());

// result=fnum;

// }

// else {

// if(sign!="%"sign!=null)

// same();

// else{

// lnum=Double.parseDouble(sb.toString());

// normal=new Normal(fnum,lnum);

// fnum=normal.surpuls();

// result=fnum;

// }

// }

// sign ="%";

// Result();

// int d=sb.length();

// sb.delete(0, d);

// dot=0;

// }

//clear

if(e.getSource()==jbc){

int d=sb.length();

sb.delete(0, d);

jl.setText("0");

dot=0;

fnum=0;

lnum=0;

sign=null;

}

}

}

class viewScientific extends viewNormal{

public viewScientific(String title){

super(title);

setBounds(200,200,800,500);

}

}

//等号以后输入符号用不了, String转 double 本来就有错误,你可以用我的扩展成科学型的。

求JAVA做的计算器完整代码,Applet实现。

下面两个可以么,是我做实验答辩时用到的!

import java.awt.*;//AWT核心包

import java.awt.event.*;//提供事件类和监听器

public class Counter extends Frame implements ActionListener

{

TextField t=new TextField("");//文本框

Panel p1=new Panel();//new一个panel,用于存放数字键和符号键。

Panel p2=new Panel();//new一个panel,用于存放开方、平方、和清除键。

Button[] b=new Button[10];//实例化Button对象

Button bAdd=new Button("加");

Button bSub=new Button("减");

Button bMul=new Button("乘以");

Button bPoint=new Button(".");

Button bDiv=new Button("除以");

Button bEqual=new Button("等於");

Button bSqrt=new Button("开方");

Button bPow=new Button("平方");

Button bNull=new Button("清除");

String str1="";     //str1和str2存放两个输入的数

String str2="";

String operator=null;   //存放加减乘除以及开平方的符号

boolean first=true;    //检验输入的是否为第一个数

int countOper=0;    //累计输入符号的个数,连加连减等操作中会用到

double result=0.0;    //暂存结果

double num1=0.0,num2=0.0;  //两个输入的数做运算时转化为double存放

boolean error=false;   //检验除数是否为0

//构造方法

public Counter()

{

Frame s=new Frame("计算器");//创建Frame

for(int i=0;i10;i++)//利用for循环将数字键添加进p1中

{

b[i]=new Button(String.valueOf(i));

p1.add(b[i]);

b[i].setActionCommand("number");

b[i].setForeground(new Color(150,20,20));

b[i].addActionListener(this);//调用addActionListener()方法注册事件监听器

}

p1.add(bPoint);

bPoint.setActionCommand("number");

p1.add(bAdd); //数字键,符号键放置在panel的p1中

p1.add(bSub);

p1.add(bMul);

p1.add(bDiv);

p1.add(bEqual);

p2.add(bSqrt);//开方键,平方键,清除键放置在panel的p2中

p2.add(bPow);

p2.add(bNull);

bAdd.setActionCommand("oper");

bSub.setActionCommand("oper");

bMul.setActionCommand("oper");

bDiv.setActionCommand("oper");

bAdd.setForeground(Color.red);//为组键设计颜色

bSub.setForeground(Color.red);

bMul.setForeground(Color.red);

bDiv.setForeground(Color.red);

bPoint.setForeground(Color.black);

bEqual.setForeground(Color.red);

bSqrt.setForeground(Color.blue);

bPow.setForeground(Color.blue);

bNull.setForeground(Color.blue);

bAdd.addActionListener(this);//调用addActionListener()方法注册事件监听器

bSub.addActionListener(this);

bMul.addActionListener(this);

bDiv.addActionListener(this);

bPoint.addActionListener(this);

bEqual.addActionListener(this);

bSqrt.addActionListener(this);

bPow.addActionListener(this);

bNull.addActionListener(this);

p1.setLayout(new GridLayout(4,4,5,5));//网格布局管理器,把容器根据行数和列数分成同样大小的单元,

//每个单元可容纳一个组件,并且此组件会填满网格单元,不能控

//制其占据网格的大小。4、4为网格的行、列数。5、5为组建之间的

//间距

p2.setLayout(new FlowLayout());//用FlowLayout布局管理器将组建默认剧中排放,默认间隙为5个像素

add(t,"North");      //frame的north放置输入框,panel放置在center和south

add(p1,"Center");//将p1添加到Center中

add(p2,"South");//将p2添加到South中

setLocation(400,200);//设计按钮尺寸

setSize(200,200);//设计窗口尺寸

setBackground(new Color(20,200,10));//设置Frame的背景,默认为白色

setVisible(true);//设置Frame设置为可见

addWindowListener(new WindowAdapter(){   //关闭窗口功能

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

}

//实现接口ActionListener

public void actionPerformed(ActionEvent e)

{

Button temp=(Button)e.getSource();

if(e.getActionCommand().equals("number"))

{

if(first)

{

str1=str1+temp.getLabel();

t.setText(str1);//将输入的str1显示在文本框中

}

else

{

str2=str2+temp.getLabel();

t.setText(str2);//将输入的str2显示在文本框中

}

}

else if(e.getActionCommand().equals("oper"))

{

if(str1=="")    //如果还没有输入数就点击运算符执行if

{

countOper=0;//若此,则将计数清零

first=true;

}

else

{

countOper++;//计算输入符号的个数

if(countOper1)//若输入的符号个数多余一个,则可以进行计算

{

getResult();

}

operator=temp.getLabel();//存放加减乘除以及开方、平方的符号

first=false;

}

}

else if(e.getActionCommand().equals("开方"))

{

double d=Math.sqrt(Double.parseDouble(str1));

str1=String.valueOf(d);//将计算出来的结果再次传给str1,为连计算准备

t.setText(String.valueOf(d));//将计算出来的结果传至文本框中

first=false;//置为false,即已输入第一个数

}

else if(e.getActionCommand().equals("平方"))

{

double f=Math.pow(Double.parseDouble(str1),2);

str1=String.valueOf(f);

t.setText(String.valueOf(f));

first=false;

}

else if(e.getActionCommand().equals("清除"))

{

str1="";//清空

str2="";

t.setText("");//将文本框清空

countOper=0;//将按键计数器清零

first=true;

error=false;

}

else if(e.getActionCommand().equals("等於"))

{

if((str1=="")||(str2==""))   //两个数没有输全就点击等号,执行if

{

countOper=0;//将按键计数器清零

first=true;

}

else

{

getResult();

countOper=0;

}

}

}

//运算结果的方法

public void getResult()

{

num1=Double.parseDouble(str1);

num2=Double.parseDouble(str2);

if(operator.equals("加"))

{

result=num1+num2;

}

else if(operator.equals("减"))

{

result=num1-num2;

}

else if(operator.equals("乘以"))

{

result=num1*num2;

}

else if(operator.equals("除以"))

{

if(num2==0.0)    //除数为0的处理方法

{

error=true;

}

else

{

result=num1/num2;

}

}

if(error)

{

t.setText("error");

}

else

{

t.setText(String.valueOf(result));

str1=String.valueOf(result);  //运算后把结果放入str1中,str2清空,为连加连减等操作做准备

str2="";

}

}

//主方法

public static void main(String[] args)

{

new Counter();//创建一个对象"计算器"

}

}

import   java.awt.*;

import   java.awt.event.*;

import   javax.swing.*;

class   CalculatorPanel   extends   JPanel

implements   ActionListener

{     public   CalculatorPanel()

{     setLayout(new   BorderLayout());

display   =   new   JTextField("0");

display.setEditable(false);

add(display,   "North");

JPanel   p   =   new   JPanel();

p.setLayout(new   GridLayout(4,   4));

String   buttons   =   "789/456*123-0.=+";

for   (int   i   =   0;   i      buttons.length();   i++)

addButton(p,   buttons.substring(i,   i   +   1));

add(p,   "Center");

}

private   void   addButton(Container   c,   String   s)

{     JButton   b   =   new   JButton(s);

c.add(b);

b.addActionListener(this);

}

public   void   actionPerformed(ActionEvent   evt)

{     String   s   =   evt.getActionCommand();

if   ('0'   =   s.charAt(0)      s.charAt(0)   =   '9'

||   s.equals("."))

{     if   (start)   display.setText(s);

else   display.setText(display.getText()   +   s);

start   =   false;

}

else

{     if   (start)

{     if   (s.equals("-"))

{   display.setText(s);   start   =   false;   }

else   op   =   s;

}

else

{     calculate(Double.parseDouble(display.getText()));

op   =   s;

start   =   true;

}

}

}

public   void   calculate(double   n)

{     if   (op.equals("+"))   arg   +=   n;

else   if   (op.equals("-"))   arg   -=   n;

else   if   (op.equals("*"))   arg   *=   n;

else   if   (op.equals("/"))   arg   /=   n;

else   if   (op.equals("="))   arg   =   n;

display.setText(""   +   arg);

}

private   JTextField   display;

private   double   arg   =   0;

private   String   op   =   "=";

private   boolean   start   =   true;

}

public   class   CalculatorApplet   extends   JApplet

{     public   void   init()

{     Container   contentPane   =   getContentPane();

contentPane.add(new   CalculatorPanel());

}

}

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