java小白——action事件，活动事件

柔光的暖阳◎ 2023-06-16 14:56 8阅读 0赞

package gui.awt;
    
    import java.awt.BorderLayout;
    import java.awt.CardLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    import javax.swing.ImageIcon;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    
    public class ActionTest {
        
    
    	public static void main(String[] args) {
        
    		new ComponentWithActionEvent();
    		// TODO Auto-generated method stub
    
    	}
    
    }
    class ComponentWithActionEvent extends JFrame implements ActionListener{
        
    	//
    	JButton button_up,button_down,button_first,button_last;//
    	JLabel label1,label2,label3;//
    	JPanel panel;//
    	CardLayout card;//
    	public ComponentWithActionEvent(){
        
    		button_up = new JButton("上一张");
    		button_down = new JButton("下一张");
    		button_first = new JButton("第一张");
    		button_last = new JButton("最后一张");
    		
    		label1 = new JLabel();//
    		label2 = new JLabel();
    		label3 = new JLabel();
    		
    		label1.setIcon(new ImageIcon("1.png"));// 将图片加入label，实现图片的显示
    		label2.setIcon(new ImageIcon("2.png"));
    		label3.setIcon(new ImageIcon("3.png"));
    		
    		panel = new JPanel();//
    		card = new CardLayout();
    		panel.setLayout(card);// 实现图片的逐一显示
    		
    		panel.add(label1);
    		panel.add(label2);
    		panel.add(label3);
    		
    		card.first(panel);
    		add(panel,BorderLayout.CENTER);//
    		add(button_up,BorderLayout.WEST);
    		add(button_down,BorderLayout.EAST);
    		add(button_first,BorderLayout.NORTH);
    		add(button_last,BorderLayout.SOUTH);
    		
    		button_up.addActionListener(this);// 注册监视器。用当前对象this作监视器,
    		button_down.addActionListener(this);// 因为当前对象所在的类实现了ActionEvent
    		button_first.addActionListener(this);// 接口，所以它可以作监视器
    		button_last.addActionListener(this);
    		
    		setTitle("action event 示例");
    		setSize(260,260);
    		setVisible(true);
    		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	}
    	public void actionPerformed(ActionEvent e){
        
    		if(e.getSource() == button_up){
        
    			card.previous(panel);
    		}
    		else if (e.getSource()==button_down) {
        
    			card.next(panel);
    			
    		}
    		else if (e.getSource()==button_first) {
        
    			card.first(panel);
    			
    		}
    		else if (e.getSource()==button_last) {
        
    			card.last(panel);
    			
    		}
    	}
    }