public   class  JFrameMinimize  extends  javax.swing.JFrame {
     public   void  run() {                   
        setTitle("Minimize");
        setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
        javax.swing.JButton jb =  new  javax.swing.JButton("Make iconfied!");
        jb.addActionListener( new  java.awt.event.ActionListener() {
             public   void  actionPerformed(java.awt.event.ActionEvent e) {
                setState(java.awt.Frame.ICONIFIED);        
            }
        });
        add(jb, java.awt.BorderLayout.SOUTH);

        setSize( 150 , 100 );
        setVisible(true);
    }
     public   static   void  main(String[] args) {
         new  JFrameMinimize().run();
    }
}

setExtendedState(java.awt.Frame.MAXIMIZED_BOTH);

setState(java.awt.Frame.NORMAL);