java编写计算器，实现计算器的简单功能。实现实数的加减乘除运算，并实现清零，和逐个清除功能。
java编写计算器，实现计算器的简单功能。实现实数的加减乘除运算，并实现清零，和逐个清除功能。
win.java
package jsq;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class win extends JFrame implements ActionListener{
String one,two,yun,ss;
int i;
JTextField f=new JTextField(20);
JMenuBar m=new JMenuBar();
JMenu m1=new JMenu("查看");
JMenu m2=new JMenu("编辑");
JMenu m3=new JMenu("帮助");
JPanel p=new JPanel();
JPanel p1=new JPanel();
JPanel p2=new JPanel();
JPanel p3=new JPanel();
JPanel p4=new JPanel();
JPanel p5=new JPanel();
String data[]={"9","8","7","6","5","4","3","2","1","0"};
JButton b1[]=new JButton[10];
String yunsuan[]={"+","-","*","/"};
JButton b2[]=new JButton[4];
JButton b3=new JButton(".");
JButton b4=new JButton("=");
JButton b5=new JButton("B");
JButton b6=new JButton("C");
JButton b7=new JButton("CE");
JLabel label1=new JLabel(" ");
JLabel label2=new JLabel(" ");
JLabel label3=new JLabel(" ");
JLabel label4=new JLabel(" ");
public win(){
init();
setTitle("计算器");
setSize(250,300);
setVisible(true);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void init(){
for(int i=0;i<b1.length;i++){
b1[i]=new JButton(data[i]);
b1[i].addActionListener(this);
}
for(int i=0;i<b2.length;i++){
b2[i]=new JButton(yunsuan[i]);
b2[i].addActionListener(this);
}
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
m.add(m1);
m.add(m2);
m.add(m3);
setJMenuBar(m);
p.setLayout(new BorderLayout());
p1.setLayout(new BorderLayout());
p2.setLayout(new GridLayout(3,1));
p3.setLayout(new GridLayout(3,3));
p4.setLayout(new GridLayout(1,3));
p5.setLayout(new GridLayout(4,1));
p2.add(b5);
p2.add(b6);
p2.add(b7);
for(int i=0;i<b1.length-1;i++){
p3.add(b1[i]);
}
p4.add(b4);
p4.add(b1[9]);
p4.add(b3);
for(int i=0;i<b2.length;i++){
p5.add(b2[i]);
}
f.setEditable(false);
f.setHorizontalAlignment(JTextField.RIGHT);
p1.add(f,BorderLayout.NORTH);
p1.add(p2,BorderLayout.WEST);
p1.add(p3,BorderLayout.CENTER);
p1.add(p4,BorderLayout.SOUTH);
p1.add(p5,BorderLayout.EAST);
p.add(label1,BorderLayout.WEST);
p.add(label2,BorderLayout.EAST);
p.add(label3,BorderLayout.SOUTH );
p.add(label4,BorderLayout.NORTH);
p.add(p1,BorderLayout.CENTER );
add(p);
}
public void actionPerformed(ActionEvent e){
for(int i=0;i<b1.length;i++){
if(e.getSource()==b1[i]){
ss=f.getText();
f.setText(ss+b1[i].getText());
}
}
for(int i=0;i<b2.length;i++){
if(e.getSource()==b2[i]){
yun=b2[i].getText();
one=f.getText();
f.setText(null);
}
}
if(e.getSource()==b3&&(f.getText().indexOf(".")<0)){
ss=f.getText();
f.setText(ss+b3.getText());
}
if(e.getSource()==b4){
double x=Double.parseDouble(one);
double y=Double.parseDouble(f.getText());
if(yun.equals("+")){
f.setText(x+y+"");
}
if(yun.equals("-")){
f.setText(x-y+"");
}
if(yun.equals("*")){
f.setText(x*y+"");
}
if(yun.equals("/")){
f.setText(x/y+"");
}
}
if(e.getSource()==b5){
ss=f.getText();
String s1=ss.substring(0,ss.length()-1);
f.setText(s1);
}
if(e.getSource()==b6){
f.setText("");
}
if(e.getSource()==b7){
f.setText("");
}
}
}
主函数：
test1.java
package jsq;
public class test1 {
public static void main(String args[]){
new win();
}
}