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無聊做個java加減乘除計算器，int型，沒有小數，，呵呵，，真特么無聊，，

package swing;

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class Test extends JFrame { //這里誤用void,返回空值

JTextField jTextField;

String num1="";

String num2="";

String flag="";

public Test() {

super();

this.setTitle("Calculator"); //窗體標題顯示

this.setSize(310, 350);

this.getContentPane().setLayout(null);

this.add(getjTextField());

for(int i = 0; i<10;i++){

this.add(getjButton(i+""));

}

this.add(getFlag("+"));

this.add(getFlag("-"));

this.add(getFlag("X"));

this.add(getFlag("/"));

this.add(getEqual());

this.add(getClear());

this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

}

public JTextField getjTextField(){

if(jTextField == null){

JTextField jTextField = new JTextField();

jTextField.setBounds(50, 49, 200, 20);

this.jTextField = jTextField;

}

return jTextField;

}

public JButton getjButton(final String num){

JButton jButton = new JButton(num);

int i = Integer.parseInt(num);

jButton.setBounds(50+i%3*50,80+i/3*50, 50, 50);

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if(flag.equals("")){

num1 = num1+num;

jTextField.setText(num1);

}else{

num2= num2 + num;

jTextField.setText(num1+" "+flag +" "+num2);

}

}

});

return jButton;

}

public JButton getFlag(final String flaginput){

JButton jButton = new JButton(flaginput);

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

jButton.setBounds(200,80, 50, 50);

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

jButton.setBounds(200,130, 50, 50);

}else if(flaginput.equals("X")){

jButton.setBounds(200,180, 50, 50);

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

jButton.setBounds(200,230, 50, 50);

}

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

flag = flaginput;

jTextField.setText(num1 + " " + flag);

}

});

return jButton;

}

public JButton getEqual(){

JButton jButton = new JButton("=");

jButton.setBounds(150,230, 50, 50);

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

if(!flag.equals("")&&!"".equals(num2)&&!"".equals(num1)){

Integer n1 = Integer.parseInt(num1);

Integer n2 = Integer.parseInt(num2);

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

num1=n1+n2+"";

jTextField.setText((n1+n2)+"");

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

num1=n1-n2+"";

jTextField.setText((n1-n2)+"");

}else if("X".equals(flag)){

num1=n1*n2+"";

jTextField.setText((n1*n2)+"");

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

num1=n1/n2+"";

jTextField.setText((n1/n2)+"");

}

num2="";

flag="";

}

}

});

return jButton;

}

public JButton getClear(){

JButton jButton = new JButton("C");

jButton.setBounds(100,230,50,50);

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

num1="";

num2="";

flag="";

jTextField.setText("");

}

});

return jButton;

}

public static void main(String[] args) throws HeadlessException {

Test kk = new Test() ;

kk.setVisible(true); //原來的show()顯示已過時

}

}

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