javac  HelloWorldSwing.java
HelloWorldSwing.java: In class `HelloWorldSwing':
HelloWorldSwing.java: In method `HelloWorldSwing.createAndShowGUI()':
HelloWorldSwing.java:15: error: Can't find method `setDefaultLookAndFeelDecorated(Z)' in type `javax.swing.JFrame'.
           JFrame.setDefaultLookAndFeelDecorated(true);
                 ^
HelloWorldSwing.java:19: error: No variable `EXIT_ON_CLOSE' defined in type `javax.swing.JFrame'.
           frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                                                ^
2 errors