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    Container c=frame.getContentPane()
    c.add(childComponent)
 
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Class MainWindow{
 
private JFrame jFrame;
 public MainWindow(){
  jFrame=null;
  initial();
  
 }
 
 private void initial() {
    getJFrame();
  
 }
 private JFrame getJFrame() {
  if(jFrame==null){
  jFrame=new JFrame();
  jFrame.setDefaultCloseOperation(3);
  jFrame.setJMenuBar(getJMenuBar());
  jFrame.setSize(408, 400);
  jFrame.setBackground(Color.GREEN);  
  jFrame.setTitle("ISTIC Searching Engine 1.0");
  jFrame.setVisible(true);
  jFrame.setLocationByPlatform(true);
 jFrame.setContentPane(getContentPane());
  }
  return jFrame;
 }
 private Container getContentPane() {
  // TODO Auto-generated method stub
  return null;
 }
 private JMenuBar getJMenuBar() {
  // TODO Auto-generated method stub
  return null;
 }
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this.str = str;
}
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