Swing动态刷新

         可能大家都试过在swing的事件监听中动态添加组件，但是JFrame却不会动态显示，只有变大变小（实际是重画了）才会显示，有些人说repaint,updateUI可以，但是我试了一下还是不行。于是用validate...发现可以了

import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Ss extends JFrame{
	Container con=this.getContentPane();
	JButton jb1=new JButton("jb1");
	JButton jb2=new JButton("jb2");
	JLabel jl1=new JLabel("jl1");
	FlowLayout gly=new FlowLayout();
	JPanel jp=new JPanel(gly);
	public Ss(){
		con.add(jp);
		
		jp.add(jb1);
		jp.add(jb2);
		
		MyListener ml=new MyListener();
		jb1.addMouseListener(ml);
		this.setSize(200,200);
		this.setVisible(true);		
	}

	private class MyListener extends MouseAdapter{
		@Override
		public void mouseClicked(MouseEvent e) {
			// TODO Auto-generated method stub
			  try
			           {
				  //主要就是下面的invalidate和validate
				  //当然，用jp来invalidate和validatae也是可以的
			                    con.invalidate();
			        			JButton jb3=new JButton("jb3");
			        			jp.add(jb3);
			        			con.validate();		           }
			          catch (Exception ex)
		           {
			            ex.printStackTrace();              
			          } 		
		}	
	}
	public static void main(String s[]){
		Ss sss=new Ss();
		sss.setVisible(true);
	}
}

 

评论

1 楼 fuzhzh 2010-10-19  

Thanks@