How Can We Change The Colour Settings Of A Jframe?

import javax.swing.*;
  import java.awt.*;
   import java.awt.event.*;

   class Renewal extends JFrame

   {
       Renewal()

             {
                 JLabel l1,l2,l3,l4,l5,l6,l7,l8;
         JTextField jt1,jt2,jt3,jt4,jt5,jt6;
         JButton jb1,jb2;
                 
                setLayout(new FlowLayout());
        l1=new JLabel("RENEWAL PASSPORT");
l2=new JLabel("OLD-PASSPORT DETAILS");

l3=new JLabel("*First Name ");
        l4=new JLabel("*Middle Name ");  
        l5=new JLabel("*SurName ");
        l6=new JLabel("*Passport Number");
l7=new JLabel("* Date OF ISSUE");
l8=new JLabel("* Place OF ISSUE");

       
        jt1=new JTextField(15);
jt2=new JTextField(15);
jt3=new JTextField(15);
jt4=new JTextField(10);
jt5=new JTextField(4);
jt6=new JTextField(10);
       

        Integer[] day={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25
,26,27,28,29,30,31};
String[] month={"JANUARY","FEBRUARY","MARCH","APRIL","MAY","JUNE","JULY","AUGUS
T","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"};

        JComboBox jc1=new JComboBox(day);
JComboBox jc2=new JComboBox(month);

SpinnerDateModel sdm=new SpinnerDateModel();
JSpinner spinner=new JSpinner(sdm);
JSpinner.DateEditor de=new JSpinner.DateEditor(spinner,"dd:MMM:yyyy");
spinner.setEditor(de);
        
        Box hbox1=new Box(BoxLayout.X_AXIS);
hbox1.add(Box.createHorizontalStrut(140));
hbox1.add(l1);

Box hbox2=new Box(BoxLayout.X_AXIS);
hbox2.add(l2);


Box hbox3=new Box(BoxLayout.X_AXIS);
hbox3.add(l3);
hbox3.add(Box.createHorizontalStrut(48));
hbox3.add(jt1);
        hbox3.add(Box.createHorizontalStrut(50));
hbox3.add(l4);
        hbox3.add(Box.createHorizontalStrut(20));
hbox3.add(jt2);  
       
         Box hbox4=new Box(BoxLayout.X_AXIS);
hbox4.add(l5);
hbox4.add(Box.createHorizontalStrut(57));
hbox4.add(jt3);

           Box hbox5=new Box(BoxLayout.X_AXIS);
hbox5.add(l6);
hbox5.add(Box.createHorizontalStrut(13));
hbox5.add(jt4);  
        
Box hbox6=new Box(BoxLayout.X_AXIS);
hbox6.add(l7);
hbox6.add(Box.createHorizontalStrut(29));
hbox6.add(spinner);  
        
        
        Box hbox7=new Box(BoxLayout.X_AXIS);
hbox7.add(l8);
        hbox7.add(Box.createHorizontalStrut(23));
        hbox7.add(jt6);
       
        

       jb1=new JButton(new ImageIcon("submit.gif"));
jb2=new JButton(new ImageIcon("cancel.gif"));


Box hbox8=new Box(BoxLayout.X_AXIS);
hbox8.add(jb1);
hbox8.add(Box.createHorizontalStrut(10));
hbox8.add(jb2);


         Box vbox1=new Box(BoxLayout.Y_AXIS);
vbox1.add(Box.createVerticalStrut(25));
vbox1.add(hbox1);
vbox1.add(Box.createVerticalStrut(20));
vbox1.add(hbox2);
vbox1.add(Box.createVerticalStrut(15));
vbox1.add(hbox3);
vbox1.add(Box.createVerticalStrut(15));
vbox1.add(hbox4);
vbox1.add(Box.createVerticalStrut(15));
vbox1.add(hbox5);
vbox1.add(Box.createVerticalStrut(15));
vbox1.add(hbox6);
vbox1.add(Box.createVerticalStrut(15));
vbox1.add(hbox7);
vbox1.add(Box.createVerticalStrut(30));
vbox1.add(hbox8);



         add(vbox1);

setSize(600,500);
setTitle("Renewal FORM");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
   
            }


public static void main(String[] args)
{
Renewal r=new Renewal();
}
}