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

public class JColorTest2 extends JFrame{

  public static void main(String[] args){
    JColorTest2 frame = new JColorTest2();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  JColorTest2(){
    JLabel label1 = new JLabel("  COLOR sample  ");
    label1.setOpaque(true);
    label1.setBackground(new Color(255,0,0,255));

    JLabel label2 = new JLabel("  COLOR sample  ");
    label2.setOpaque(true);
    label2.setBackground(new Color(255,0,0,128));

    JLabel label3 = new JLabel("  COLOR sample  ");
    label3.setOpaque(true);
    label3.setBackground(new Color(255,0,0,64));

    JLabel label4 = new JLabel("  COLOR sample  ");
    label4.setOpaque(true);
    label4.setBackground(new Color(255,0,0,0));

    JPanel p = new JPanel();
    p.add(label1);
    p.add(label2);
    p.add(label3);
    p.add(label4);

    getContentPane().add(p);
  }
}