java实现凯撒密码

public class Caesar {


//利用凯撒密码对输入的字母加密后出一个加密后的字母
public static String table = "abcdefghifjmnlqpqrstuvwxyz";
public static char cipher(char str){
  int position = (table.indexOf(str)+3)%26;
  System.out.print(position+":");
  return table.charAt(position);

}


public static  void main(String args[]){
  //key:219 ,palin:chenzhen
  String plain = "chenzhen";
  System.out.print("明文为："+plain);
  char []data = plain.toCharArray();
  for(int  i=0;i<data.length;i++){
   data[i]=cipher(data[i]);
  }

  System.out.println("加密后为："+new String(data));
}

}