献上代码

package cn.seu.ecampus.ServerView;

import java.awt.BorderLayout;
import java.
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTable;

import cn.seu.ecampus.ServerControl.SControl;

public class SBankView extends JPanel{

SControl sc;
public JButton add;
public JButton delete;
public JTable table;
public SBankView(SControl sc){
super();
this.sc = sc;
init();
}

private void init() {
setSize(570,410);
//     setLocation(ViewTool.getLocation(800,600));
//     setTitle("银行管理");
//     setDefaultCloseOperation(EXIT_ON_CLOSE);
//     setContentPane(createPane());
setOpaque(false);
setLayout(null);
setVisible(true);
add(createPane(),BorderLayout.CENTER);
}

private Container createPane() {
JPanel jp = new JPanel(new BorderLayout());
jp.add(createNorthPane(), BorderLayout.CENTER);
jp.add(createSouthPane(), BorderLayout.SOUTH);
jp.setOpaque(false);
System.out.println(1);
return jp;
}

private Component createSouthPane() {
JPanel jp = new JPanel(new FlowLayout());
JButton fresh = new JButton("刷新信息");
jp.setOpaque(false);
System.out.println(2);
return jp;
}

private Component createNorthPane() {
JPanel jp = new JPanel(new BorderLayout());
JPanel left = new JPanel(new GridLayout(2,1));
JPanel right = new JPanel(new BorderLayout());
jp.setOpaque(false);
left.setOpaque(false);
right.setOpaque(false);
add = new JButton("添加账户");
   delete = new JButton("删除账户");
add.setEnabled(false);
delete.setEnabled(false);
left.add(add);
left.add(delete);
String[] cols = {"户主姓名","账号","账户余额"};
table = new JTable(new MyTableModel(sc,cols, "bank"));
right.add(table);
System.out.println(3);
return jp;
}
}

然后再另一个继承JFrame的类中用setcontpane()中加上new 的这个实例化，结果显示一片灰色，什么组件都没有，求大神解答。