Fix the errors

4. public class RTwo extends JFrame \ public RTwoProgramO private JLabel length, width, area; setTitle("Good day Area") length - JLabel("Enter the length); width JLabel("Enter the width); area-Label("Area : "); containerPane = ContentPane(); pane.setLayout(GridLayout(4,1)); setSize(WIDTH,HEIGHT); setVisible0 setDefaultCloseOperation(EXIT_ON_CLOSE); public static void main(String args]) RTwoProgram R2 = new RTwProgram(); 5. public static int squareNum( double x) return x*x