popupmenuexample.java

来自「清华大学辛运帏java程序设计第二版源代码」· Java 代码 · 共 39 行

import java.awt.*;
import java.awt.event.*;

public class PopupMenuExample
		implements ActionListener {
	Frame f;
	Button b;
	PopupMenu pm;

	public static void main(String args[]) {
		PopupMenuExample pme = new PopupMenuExample();
		pme.init();
	}

	void init() {
		f = new Frame("PopupMenu Example");
		b = new Button("Press me");
		b.addActionListener(this);
		f.add(b,"Center");


		// 创建弹出式菜单
		pm = new PopupMenu("Popup");
		// 加入菜单项
		pm.add(new MenuItem("New"));
		pm.add(new MenuItem("Load"));
		pm.add(new MenuItem("Save"));
		pm.add(new MenuItem("Sava as..."));
		f.add(pm);
		f.setSize(200,200);
		f.setVisible(true);
	}

	// 实现ActionListener接口
	public void actionPerformed(ActionEvent e) {
	// 以按钮b的位置为参考原点，在(10,10)显示弹出式菜单
		pm.show(b,10,10);
	}
}