java程序组件及事件处理

Question

 

设计一个窗口，窗口标题为  “姓名+‘的Java窗口’”，该窗口中包括：一个菜单“系统菜单”，一个Label标签，两个按钮Button1和Button2。当选择菜单时，在标签中显示文字：“系统菜单被选择”；点击按钮Button1时，在button2上显示Button1被点击了多少次。

Answer 1

package javaForm.Form1;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;

public class MainWindow extends JFrame{
	
	private static final long serialVersionUID = 1L;

	JMenuBar bar;
	JMenu menu;
	JLabel label;
	JButton button1;
	JButton button2;
	JPanel panel;
	
	public MainWindow(String title) {
		//组件
		bar = new JMenuBar();
		menu = new JMenu("系统菜单");
		label = new JLabel("label");
		button1 = new JButton("button1");
		button2 = new JButton("button2");
		panel = new JPanel();
		
		//组件属性及事件设置
		menu.addMenuListener(new MenuActionListener(label));
		button1.addActionListener(new ButtonActionListener(button2));
		//组件组合至窗口
		bar.add(menu);
		
		panel.add(label);
		panel.add(button1);
		panel.add(button2);
		
		this.setJMenuBar(bar);
		this.add(panel);
		
		//窗口属性设置
		this.setTitle(title);
		this.setLocation(400, 300);
		this.setSize(500, 300);
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	public static void main(String[] args) {
		MainWindow window = new MainWindow("测试的java窗口");
	}

}


package javaForm.Form1;

import javax.swing.JLabel;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;

public class MenuActionListener implements MenuListener {

	private JLabel label;
	
	public MenuActionListener(JLabel label) {
		this.label = label;
	}
	
	@Override
	public void menuSelected(MenuEvent e) {
		label.setText("系统菜单被选择");
		
	}

	@Override
	public void menuDeselected(MenuEvent e) {
		label.setText("label");
		
	}

	@Override
	public void menuCanceled(MenuEvent e) {
		label.setText("label");
	}

}


package javaForm.Form1;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;

public class ButtonActionListener implements ActionListener{

	private JButton button2;
	
	private int clickCount;
	
	public ButtonActionListener(JButton button2) {
		this.button2 = button2;
	}
	
	@Override
	public void actionPerformed(ActionEvent e) {
		clickCount ++;
		this.button2.setText("" + clickCount);
		
	}

}