sayhello对话框练习

Love The Way You Lie 2024-02-18 18:12 75阅读 0赞

package sayHello;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    public class Main extends JFrame {
    	JButton bt1 =new JButton("说你好");
    	
    	JLabel lb =new JLabel();
    	public Main() {
    		setLayout(new FlowLayout());
    		add(bt1);
    		
    		add(lb);
    		this.setSize(300,200);
    		this.setLocationRelativeTo(null);
    		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		this.setVisible(true);
    		
    		bt1.addActionListener(new BtListener());
    	
    	}
    	
    	class BtListener implements ActionListener{
    		public void actionPerformed(ActionEvent e) {
    			Child dlg =new Child(Main.this);
    			dlg.setSize(200,100);
    			dlg.setTitle("模态对话框");
    			dlg.setLocationRelativeTo(null);//定位在显示器正中间
    			dlg.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    			dlg.setModal(true);//设置模态对话框
    			dlg.lb.setText("你好");//向对话框传值
    			dlg.setVisible(true);
    		}
    	}
    	
    	
    	
    	
    	public static void main(String[] args) {		
    		new Main();
    	}
    
    }

package sayHello;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    public class Child  extends JDialog {
    	
    	Main main =null;//表示探出此对话框的主窗口，由主窗口创建对话框时传递过来
    	JLabel lb =new JLabel();
    	
    	public Child(Main main) {
    		this.main=main;//主窗口传来后，即可对主窗口及其组件进行操作
    		setLayout(new FlowLayout());		
    		add(lb);		
    	}
    	
    }

![20180218123351979][] ![20180218123400838][]

[20180218123351979]: https://img-blog.csdn.net/20180218123351979
[20180218123400838]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/fdaccf2bb2a7468b8891424ca16cd253.png