JFrame设计无法显示

xianjiangao 2008-03-21 11:03:37

import java.awt.Dimension;

import javax.swing.*;
public class DesignGUI extends JFrame{

private JPanel jpanel;
private JLabel label_title;
private JLabel label_path;
private JLabel label_port;

public DesignGUI()
{
jpanel=new JPanel();

label_title=new JLabel("--1---------123----------1-\n");
label_path=new JLabel("11: ");
label_port=new JLabel("22: ");

this.getContentPane().setLayout(null);
jpanel.setLayout(null);
jpanel.setPreferredSize(new Dimension(400,300));
label_title.setBounds(20, 220, 20, 20);
label_path.setBounds(50, 90, 20, 20);
label_port.setBounds(20, 120, 20, 20);
jpanel.add(label_title);
jpanel.add(label_path);
jpanel.add(label_port);

this.setSize(400,300);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(jpanel);
}

public static void main(String[] args)
{
DesignGUI g=new DesignGUI();

}

}
代码见上，可是程序执行完以后不能显示内容，请问这是为什么？大家多帮忙·谢谢~~

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badonly 2008-03-21

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看来你没找对教材

xianjiangao 2008-03-21

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非常感谢·终于好了·

dracularking 2008-03-21

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把两句

setLayout(null);

去掉

xianjiangao 2008-03-21

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import java.awt.Dimension;



import javax.swing.*;

public class DesignGUI extends JFrame{



	private JPanel jpanel;

	private JLabel label_title;

	private JLabel label_path;

	private JLabel label_port;



	

	public DesignGUI()

	{

		jpanel=new JPanel();



		label_title=new JLabel("--1---------123----------1-\n");

		label_path=new JLabel("11: ");

		label_port=new JLabel("22: ");  

		

		this.getContentPane().setLayout(null); 

		jpanel.setLayout(null);

		jpanel.setPreferredSize(new Dimension(400,300));

		label_title.setBounds(20, 220, 20, 20);

		label_path.setBounds(50, 90, 20, 20);

		label_port.setBounds(20, 120, 20, 20);

		jpanel.add(label_title);

		jpanel.add(label_path);

		jpanel.add(label_port);

		

		this.setSize(400,300);

		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		this.add(jpanel);

		this.setVisible(true);

	}

	

	public static void main(String[] args)

	{

		DesignGUI g=new DesignGUI();

		//g.setVisible(true);



	}

	

	

}