myeclipse无法进行图形界面编程

package com.test1;



import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollBar;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;



public class MyServer3 extends JFrame{

	JTextArea jta=null;

	JTextField jtf=null;

	JButton jb=null;

	JScrollPane jsp=null;

	

	JPanel jp1=null;

	



	/**

	 * @param args

	 */

	public static void main(String[] args) {

		// TODO Auto-generated method stub



	}

	public MyServer3(){

		jta=new JTextArea();

		jsp=new JScrollPane(jta);

		jtf=new JTextField(20);

		jb=new JButton("发送");

		jp1=new JPanel();

		jp1.add(jtf);

		jp1.add(jb);

		

		this.add(jsp,"Center");

		this.add(jp1,"South");

		this.setSize(400,300);

		this.setVisible(true);

		

	}



}