Swing中JButton和JComboBox的单击事件

两个控件的单击事件是一致的：

JButton单击事件：

JButton but=new JButton("按钮");
		     but.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				
				System.out.println("===================");
			}
		});

JComboBox事件：

JComboBox box= new JComboBox();
		box.addItem("test1");
		box.addItem("test2");
		box.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("---------------------");
			}
		});