jiami.java

java的三个源代码,IP的查询,求最大值,加密三个例子,供初学者学习用.

package jiami;
import java.io.*;
import java.lang.*;
public class Jiami {
       public static void main (String[] args)
       {
               char c='b';
               int num,num2;
               System.out.print("Enter a character[A-Z] please:");
               try
               {
                       c=(char)System.in.read();
               }catch(IOException e){}
               num=(int)(c);
               if(num<65||num>90)
               {
                 System.out.println("输入的不是大写字母，请重新输入！") ;
                 return;
               }
               num2=155-num;
               c=(char)num2;
               System.out.println("加密后的结果为: "+c);
       }
}