java计算器16个按钮(要用for循环打出来的)源代码

自己写的，给你参考参考import java.awt.BorderLayout;

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import java.awt.FlowLayout;

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.JPanel;

import javax.swing.JTextField;public class Counter implements ActionListener{ /**

* @param args

*/

private JFrame frame;

private JTextField field;

private JButton clear_but;

private JButton[] buttons;

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

public Counter() {

frame=new JFrame("计算器t\t\t\t\t\t\t");

field=new JTextField(15);

clear_but=new JButton("C");

buttons=new JButton[25];

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

{

buttons[i]=new JButton(str.substring(i, i+1));

}

field.setText("");

}

private void init(){

addEventHandler();

frame.setLayout(new BorderLayout());

JPanel n_panel=new JPanel();

JPanel c_panel=new JPanel();

n_panel.setLayout(new FlowLayout());

frame.add(n_panel,BorderLayout.NORTH);

n_panel.add(field);

n_panel.add(clear_but);

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

for(int i=0;i16;i++)

{

c_panel.add(buttons[i]);

}

frame.add(c_panel, BorderLayout.CENTER);

}

public void showMe(){

init();

frame.setSize(300, 240);

//frame.pack();// frame.setLocation(400,360);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private void addEventHandler(){

//clear_but.addActionListener(new MyActionListener());

clear_but.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

field.setText("");

}

});

for(int i=0;i16;i++)

{

final int in=i;

buttons[i].addActionListener(this);

// @Override

// public void actionPerformed(ActionEvent e) {

// System.out.print(e.getActionCommand());

// //System.out.print(str.substring(in, in+1));

// }

//

}

}

String num="";

String flag="";

//@Override

public void actionPerformed(ActionEvent e) {

String str=e.getActionCommand();

if(str.equals("=")){

Double a=Double.valueOf(num);

Double b=Double.valueOf(field.getText());

double sum=0;

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

sum=a+b;

field.setText(sum+"");

}

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

sum=a-b;

field.setText(""+sum);

}

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

sum=a*b;

field.setText(""+sum);

}

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

sum=a/b;

field.setText(""+sum);

}

System.out.println(a+flag+b+"="+sum);

}

else if(".0123456789".indexOf(str)!=-1){

String newtext=field.getText();

newtext+=str;

field.setText(newtext);

//System.out.print(str);

}

else if(str.matches("[+*-/]{1}")){

//else if("+-*/".indexOf(str)!=-1){

num=field.getText();

field.setText("");

flag=str;

// System.out.print(str);

}

}

public static void main(String[] args) {

new Counter().showMe();

}}

求java源代码。使用swing或AWT。实现功能:点击按钮，选择一个txt文本文件，并将txt中

搞定了

package com.monubia;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JFileChooser;

import javax.swing.JTextArea;

import javax.swing.WindowConstants;

import javax.swing.SwingUtilities;

import javax.swing.filechooser.FileNameExtensionFilter;

/**

* This code was edited or generated using CloudGarden's Jigloo

* SWT/Swing GUI Builder, which is free for non-commercial

* use. If Jigloo is being used commercially (ie, by a corporation,

* company or business for any purpose whatever) then you

* should purchase a license for each developer using Jigloo.

* Please visit  for details.

* Use of Jigloo implies acceptance of these licensing terms.

* A COMMERCIAL LICENSE HAS NOT BEEN PURCHASED FOR

* THIS MACHINE, SO JIGLOO OR THIS CODE CANNOT BE USED

* LEGALLY FOR ANY CORPORATE OR COMMERCIAL PURPOSE.

*/

public class Txt extends javax.swing.JFrame {

private JButton jButton_open;

private JTextArea jTextArea1;

/**

* Auto-generated main method to display this JFrame

*/

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() {

Txt inst = new Txt();

inst.setLocationRelativeTo(null);

inst.setVisible(true);

}

});

}

public Txt() {

super();

initGUI();

}

private void initGUI() {

try {

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

getContentPane().setLayout(null);

{

jButton_open = new JButton();

getContentPane().add(jButton_open);

jButton_open.setText("Open");

jButton_open.setBounds(155, 114, 92, 49);

jButton_open.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent evt) {

jButton_openMouseClicked(evt);

}

});

}

{

jTextArea1 = new JTextArea();

getContentPane().add(jTextArea1);

jTextArea1.setBounds(0, 0, 384, 262);

}

pack();

setSize(400, 300);

} catch (Exception e) {

//add your error handling code here

e.printStackTrace();

}

}

private void jButton_openMouseClicked(MouseEvent evt) {

//点击了打开

JFileChooser open=new JFileChooser();

FileNameExtensionFilter txt= new FileNameExtensionFilter("Txt File", "txt");

open.setFileFilter(txt);

int ret=open.showOpenDialog(this);

if(ret==JFileChooser.APPROVE_OPTION)

{

jButton_open.setOpaque(false);

jButton_open.setVisible(false);

System.out.println(open.getSelectedFile().getAbsolutePath());

try {

BufferedReader br=new BufferedReader(new FileReader(open.getSelectedFile().getAbsolutePath()));

String line=null;

while((line=br.readLine())!=null)

{

jTextArea1.append(line+"\n");

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

java课程设计源代码（急！！！！）

import java.awt.Color;

import java.awt.Font;

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.JOptionPane;

import javax.swing.SwingConstants;

import javax.swing.border.LineBorder;

public class game21 extends JFrame {

private JLabel label_2;

private int number;

private int sum;

final JLabel label = new JLabel();

final JLabel label_1 = new JLabel();

public static void main(String[] args) {

new game21();

}

public game21() {

super("21点？！");

getContentPane().setLayout(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JButton button = new JButton();

button.addActionListener(new ActionListener() {

public void actionPerformed(final ActionEvent arg0) {

onClick();

}

});

button.setText("出牌");

button.setBounds(170, 350, 106, 28);

getContentPane().add(button);

label.setBorder(new LineBorder(Color.black, 1, false));

label.setHorizontalAlignment(SwingConstants.CENTER);

label.setFont(new Font("", Font.BOLD, 26));

label.setText("背面");

label.setBounds(158, 81, 137, 153);

getContentPane().add(label);

label_1.setText("你已经拥有的牌:");

label_1.setBounds(109, 22, 270, 45);

getContentPane().add(label_1);

this.setBounds(200, 300, 501, 528);

this.setVisible(true);

getContentPane().add(getLabel_2());

}

public int randNumber() {

try {

Thread.sleep(10);

} catch (InterruptedException e) {

e.printStackTrace();

}

return (int) (Math.random() * 10 + 1);

}

public void onClick() {

number = this.randNumber();

this.sum += number;

label.setText("" + number);

String strTemp = this.label_1.getText();

strTemp += "" + number + " ";

label_1.setText(strTemp);

String temp = "合计：" + sum;

label_2.setText(temp);

isWin();

}

public void isWin() {

if (sum 21) {

JOptionPane.showMessageDialog(this, "你输了");

clear();

return;

} else if (sum == 21) {

JOptionPane.showMessageDialog(this, "你赢了");

clear();

return;

} else {

int i = JOptionPane.showOptionDialog(this, "是否继续？", "提示",

JOptionPane.OK_CANCEL_OPTION,

JOptionPane.INFORMATION_MESSAGE, null, null, null);

if (i == JOptionPane.OK_OPTION) {

onClick();

} else

return;

}

}

private void clear() {

label_2.setText("合计：");

sum = 0;

number = 0;

label_1.setText("你已经拥有的牌:");

}

/**

* @return

*/

protected JLabel getLabel_2() {

if (label_2 == null) {

label_2 = new JLabel();

label_2.setText("合计:");

label_2.setBounds(313, 35, 66, 18);

}

return label_2;

}

}

真好无聊中。。

怎么用java编写一个按钮界面

新建一个窗口，然后实现一个关闭按钮”窗口的功能

import java.awt.*;

import java.awt.event.*;

public class TestWindowEvent {

public static void main (String[] args) {

new Frame88 ("WindowAdapter");

}

}

class Frame88 extends Frame {

Frame88 (String s) {

super(s);

setBounds (300,300,200,70);

setLayout (null);

setVisible (true);

addWindowListener (new WindowAdapter() {

public void windowClosing(WindowEvent e) {

setVisible (false);

System.exit(0);

}

}  );

} 

}

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