changestr.java

用接口实现大小写转换2

import java.awt.*;
import java.applet.*;

public class changestr  extends Applet
{public void paint (Graphics g)
 {Font f=new Font("Dialog",Font.PLAIN,25);
  Color e;
  Color h;
  int i;
  String a=new String("I     AM      student");
  String b=new String("i     am      STUDENT");
  String c=new String();  
  String d=new String();
   c=a.toUpperCase();
   d=b.toLowerCase();
   g.setFont(f);
   for(i=1;;i=i+1)
  {
   e=new Color((i+50)%255,(i+100)%255,(i+150)%255);
   h=new Color(i%255,(150+i)%255,(i+75)%255);
  
   g.setColor(e);
   g.drawString("I     AM     student   转换大写为   "+c,10,50);
   g.setColor(h);
   g.drawString("i     am     STUDENT   转换小写为   "+d,10,80);
}
}
}