Color Class in Java Examples

The Color class is used to create colors in the default RGB color space or colors in any color spaces defined by a ColorSpace. Every color has an implicit alpha value of 1.0 or an explicit one provided in the constructor. The alpha value defines the transparency of a color and can be represented by a float value in the range 0.0 – 1.0 or 0 – 255. An alpha value of 1.0 or 255 means that the color is completely opaque and an alpha value of 0 or 0.0 means that the color is completely transparent. When constructing a Color with an explicit alpha or getting the color/alpha components of a Color, the color components are never pre multiplied by the alpha component.

import java.awt.*; 
 import java.awt.event.*; 
 import java.applet.*; 
 /* <APPLET CODE ="ColorClass.class" WIDTH=300 HEIGHT=200> </APPLET> */ 
 public class ColorClass extends Applet implements ItemListener 
   { 
       Choice l; 
       public void init() 
         { 
             l=new Choice(); 
             l.addItem("Black"); 
             l.addItem("Blue"); 
             l.addItem("Cyan"); 
             l.addItem("Dark Gray"); 
             l.addItem("Gray"); 
             l.addItem("Green"); 
             l.addItem("Light Gray"); 
             l.addItem("Magenta"); 
             l.addItem("Orange"); 
             l.addItem("Pink"); 
             l.addItem("Red"); 
             l.addItem("White"); 
             l.addItem("Yellow"); 
             add(l); 
             l.addItemListener(this); 
         }  
             public void itemStateChanged(ItemEvent e) 
                { 
                   repaint(); 
                }  
                   public void paint(Graphics g) 
                     { 
                        if(l.getSelectedItem()=="Black") 
                           { 
                              setBackground(Color.black); 
                           } 
                              if(l.getSelectedItem()=="Blue") 
                                { 
                                   setBackground(Color.blue); 
                                } 
                                   if(l.getSelectedItem()=="Cyan") 
                                     { 
                                       setBackground(Color.cyan); 
                                     } 
                                       if(l.getSelectedItem()=="Dark Gray") 
                                         { 
                                            setBackground(Color.darkGray); 
                                         } 
                                            if(l.getSelectedItem()=="Gray") 
                                              { 
                                                 setBackground(Color.gray); 
                                              } 
                                                 if(l.getSelectedItem()=="Green") 
                                                   { 
                                                      setBackground(Color.green); 
                                                   } 
                                                      if(l.getSelectedItem()=="Light Gray") 
                                                         { 
                                                             setBackground(Color.lightGray); 
                                                         } 
                                                             if(l.getSelectedItem()=="Magenta") 
                                                               { 
                                                                   setBackground(Color.magenta); 
                                                               }  
                                                                   if(l.getSelectedItem()=="Orange") 
                                                                    { 
                                                                        setBackground(Color.orange); 
                                                                    } 
                                                                        if(l.getSelectedItem()=="Red") 
                                                                          { 
                                                                              setBackground(Color.red); 
                                                                          }    
                                                                              if(l.getSelectedItem()=="Pink") 
                                                                                { 
                                                                                   setBackground(Color.pink); 
                                                                                }  
                                                                                    
                                                                                        if(l.getSelectedItem()=="White") 
                                                                                     { 
                                                                                       setBackground(Color.white);                                                                                                  } 
                                                                                       if(l.getSelectedItem()=="Yellow") 
                                                                                          { 
                                                                                             setBackground(Color.yellow); 
                                                                                          } 
                    } 
   }