colordemo.java

javaME useful code with the J2ME helpful learning cla

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class ColorDemo extends Canvas
{
public void paint(Graphics g)
{
g.setColor(255,255,0);
g.fillRect(0,0,getWidth(),getHeight());
int c=g.getColor();
int dc=g.getDisplayColor(g.getColor());
System.out.println("当前画面的颜色为："+Integer.toHexString(c));
System.out.println("当前画面的R 值为："+g.getRedComponent());
System.out.println("当前画面的G 值为："+g.getGreenComponent());
System.out.println("当前画面的B 值为："+g.getBlueComponent());
System.out.println("当前画面的显示颜色为："+Integer.toHexString(dc));
System.out.println("当前画面的灰度为："+g.getGrayScale());
}
}