java swing窗口上右上角那个X的点击事件怎么添加？

定义一个基或全局变量result,也就成员变量来保存你计算出来的结果，点第二个按钮，你就读取这个全局变量result的值就可以了。然后用流 *** 作就可以轻易实现写到文件里面去在第二个按钮的事件里面这样写

int

result=result

//这是你在第一步正锋磨计算后得到的值，保存在全局变量result里面

然后

如果

你要保存到的文件目录是d:/result.txt

那么就可以实例化一个文件输出流

fileoutputstream

fis

=

new

fileoutputstream("d:/result.txt

")

fis.writeint(result)

然后举斗你要将它读出来的时候

可以实例化一个文件输入流

fileintputstream

fis

=

new

fileintputstream("d:/result.txt

")

int

result=

fis.readint(result)

system.out.print("从文件中读取的结果为："+result)

这样就ok了

import java.awt.FlowLayout

import java.awt.event.ActionEvent

import java.awt.event.ActionListener

import javax.swing.JButton

import javax.swing.JDialog

import javax.swing.JFrame

import javax.swing.JLabel

import javax.swing.JOptionPane

import javax.swing.JPanel

import javax.swing.JScrollPane

import javax.swing.JTextArea

import javax.swing.JTextField

public class MainFrame {

private JFrame frame = new JFrame()

private JButton add = new JButton("添加")

private JButton del = new JButton("删除信宴洞")

private JButton update = new JButton("修改")

private JPanel panel = new JPanel()

private JTextArea message = new JTextArea(10, 20)

private JScrollPane message_pane = new JScrollPane(message)

private JTextField name = null

private JTextField password = null

private JScrollPane update_message_pane = null

private JTextArea update_message = null

public static void main(String[] args) {

MainFrame mf = new MainFrame()

mf.init()

mf.addActionListener()

}

/祥咐/ 向文本域添加值

private class Enroll_BtnAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

if (!name.getText().equals("") &&!password.getText().equals("")) {

message.append("姓名:" + name.getText() + " " + "密码:"

+ password.getText())

} else {

System.out.println("用户名密码为空")

}

}

}

private class Update_BtnAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

message.setText(update_message.getText())

}

}

// 为按钮添加事件

public void addActionListener() {

ActionListener add_action = new ActionListener() {

public void actionPerformed(ActionEvent e) {

JDialog enroll_dialog = new JDialog(frame, "滑枯注册", true)

JLabel name_t = new JLabel("姓名")

name = new JTextField(10)

JLabel password_t = new JLabel("密码")

password = new JTextField(10)

JButton enroll_ok = new JButton("确定")

enroll_dialog.setLayout(new FlowLayout())

enroll_dialog.add(name_t)

enroll_dialog.add(name)

enroll_dialog.add(password_t)

enroll_dialog.add(password)

enroll_dialog.add(enroll_ok)

enroll_dialog.setBounds(20, 10, 180, 350)

enroll_ok.addActionListener(new Enroll_BtnAction())

enroll_dialog.setVisible(true)

}

}

// 清空文本域

ActionListener del_action = new ActionListener() {

public void actionPerformed(ActionEvent e) {

message.setText("")

}

}

ActionListener update_action = new ActionListener() {

public void actionPerformed(ActionEvent e) {

JDialog update_dialog = new JDialog(frame, "修改", true)

update_message= new JTextArea(18,20)

update_message_pane= new JScrollPane(update_message)

JButton update_ok = new JButton("确定")

update_message.setText(message.getText())

update_message.setWrapStyleWord(true)

update_dialog.add(update_message_pane)

update_dialog.add(update_ok)

update_dialog.setLayout(new FlowLayout())

update_dialog.setBounds(600, 100, 240, 400)

update_ok.addActionListener(new Update_BtnAction())

update_dialog.setVisible(true)

}

}

add.addActionListener(add_action)

del.addActionListener(del_action)

update.addActionListener(update_action)

}

// 控件初始化

public void init() {

frame.setBounds(100, 100, 400, 400)

panel.setLayout(new FlowLayout())

panel.add(add)

panel.add(del)

panel.add(update)

panel.add(message_pane)

message.setEditable(false)

frame.add(panel)

frame.setVisible(true)

frame.setDefaultCloseOperation(3)

}

}

答: 可棚蔽桐以给文本域JTextArea添加鼠标点击事件

效果图

参考代码

import java.awt.event.*

import javax.swing.*

public class JTFDemo extends JFrame {

public JTFDemo() {

JTextArea jtf1 = new JTextArea()//创建文本域JTextArea

//给文本域添加事件

jtf1.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {//当点击文本域时..d出对话框

JOptionPane.showMessageDialog(null, "点击了文本域")

}

})

add(jtf1)

setTitle("测试Demo")// 标题

setSize(280, 180)// 窗口大小

setLocationRelativeTo(null)// 并亏窗口居中链坦

setDefaultCloseOperation(EXIT_ON_CLOSE)// 窗口点击关闭时,退出程序

setVisible(true)// 窗口可见

}

public static void main(String[] args) {

new JTFDemo()

}

}

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