//Import javax.swing.*; public class c01 extends javax.swing.JFrame {     public c01() {         // TODO Auto-generated constructor stub         setTitle("This is my first window");         // setSize(640-30, 480-30);         setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);         setVisible(true);         setBounds(100, 100, 640 - 30, 480 - 30);     }     public static void main(String[] args) {         // TODO Auto-generated method stub         c01 c01_instance = new c01();         System.out.print("\n\n  c01_instance.toString() = {{{  "                 + c01_instance.toString() + "  }}}  \n\n");     } }