Frame button background colour example.

import java.awt.*;
import java.awt.event.*;

class ChangeButtonBackground
{
public static void main(String surat[])
{
Frame f=new Frame("ChangeButtonBackground");
Button b = new Button("Color Button");
b.setBackground(Color.yellow);
f.add(b,BorderLayout.NORTH);
f.pack();
f.setSize(300,300);
f.setVisible(true);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
}

Output: