字符串加密

//20142966 黄伟鹏
//2015.10.25
//信1405-1班
public class Decode {

    public static void main(String[] args) {
        String s1="abcdefx";
    for(int i=0;i<s1.length();i++)
        {
        char s2=s1.charAt(i);
        char s3;
        if(s2=='x')
        {
            s3='a';
        }
        else if(s2=='y')
        {
            s3='b';
        }
        else if(s2=='z')
        {
            s3='c';
        }
        else
        {
            s3=(char) (s2+3);
        }
        
        System.out.print(s3);
    
        }
        
        
            
    }

}