Java二级操作题界面题（卷19）

最新推荐文章于 2025-06-01 20:14:44 发布

Ys_superman

最新推荐文章于 2025-06-01 20:14:44 发布

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本文链接：https://blog.youkuaiyun.com/qq_38945163/article/details/81504776

这篇博客展示了如何使用Java Swing库创建多窗口应用程序。`MulticastFrame` 类作为主窗口，包含`MulticastPanel`，后者包含两个按钮：“New”和“Close all”。点击“New”按钮会创建一个新的`BlankFrame`窗口，而点击“Close all”则关闭所有已创建的`BlankFrame`窗口。每个`BlankFrame`窗口都有唯一的标题并能动态定位。

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Java_3{
public static void main(String[] args){
MulticastFrame frame = new MulticastFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}

class MulticastFrame extends JFrame{
public MulticastFrame(){
setTitle("MulticastTest");
setSize(WIDTH, HEIGHT);
MulticastPanel panel = new MulticastPanel();
Container contentPane = getContentPane();
//*********Found**********
contentPane.add(panel);
}
public static final int WIDTH = 300;
public static final int HEIGHT = 200;
}

class MulticastPanel extends JPanel{
public MulticastPanel(){
JButton newButton = new JButton("New");
add(newButton);
ActionListener newListener = new ActionListener(){
public void actionPerformed(ActionEvent event){
makeNewFrame();
}
};
newButton.addActionListener(newListener);
closeAllButton = new JButton("Close all");
add(closeAllButton);
}
private void makeNewFrame(){
final BlankFrame frame = new BlankFrame();
frame.show();
ActionListener closeAllListener = new ActionListener(){
public void actionPerformed(ActionEvent event){
//*********Found**********
frame.setVisible(false); //使窗口隐藏或消除
}
};
//*********Found**********
closeAllButton.addActionListener(closeAllListener);
}
private JButton closeAllButton;
}

class BlankFrame extends JFrame{
public BlankFrame(){
//*********Found**********
counter ++ ;
setTitle("Frame " + counter);
setSize(WIDTH, HEIGHT);
setLocation(SPACING * counter, SPACING * counter);
}
public static final int WIDTH = 200;
public static final int HEIGHT = 150;
public static final int SPACING = 30;
private static int counter = 0;
}