Sandbox::https://github.com/for0231/java_demo/blob/master/UseColor.java

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import java.awt.*;

import java.applet.*;

import java.awt.geom.*;

public class UseColor extends Applet

{

public void paint(Graphics oldg)

{

Graphics2D g=(Graphics2D)oldg;

g.setColor(Color.blue);

g.fill(new Ellipse2D.Float(50,50,150,150));

g.setColor(new Color(255,0,0,0));

g.fill(new Ellipse2D.Float(50,50,140,140));

g.setColor(new Color(255,0,0,64));

g.fill(new Ellipse2D.Float(50,50,130,130));

g.setColor(new Color(255,0,0,128));

g.fill(new Ellipse2D.Float(50,50,110,110));

g.setColor(new Color(255,0,0,255));

g.fill(new Ellipse2D.Float(50,50,90,90));

g.setColor(new Color(255,200,0));

g.fill(new Ellipse2D.Float(50,50,70,70));

}