用Java将一个整数用二进制、八进制和十六进制输出

用java的Integer本身配有的方法。

public class Test 

{    public static void main(String[] args) 

{       int n = 100;      

 System.out.println("二进制:" + Integer.toBinaryString(n));     

  System.out.println("八进制:" + Integer.toOctalString(n));       

System.out.println("十六进制:" + Integer.toHexString(n));    } } 

写一个程序实现

public class Trans { 

 private static char[] a = { '0', '1', '2', '3',  '4', '5', '6', '7',  '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; 

public static void main(String[] args) {  

 int number = 10;  

 System.out.println(number + "二进制: " + toNumber(number, 2));  

 System.out.println(number + "八进制: " + toNumber(number, 8));  

 System.out.println(number + "十六进制: " + toNumber(number, 16));  }    

public static String toNumber(int number, int n) 

{   String str="";

   for(int i = 0; i < n; i ++) { 

   if(number == i) {     str=a[i] + str;     return str;   

 }   }  

 str = a[number % n] + str; 

 str = toNumber(number/n, n) + str;  

 return str;  } }


转载自 http://novicechan.blog.163.com/blog/static/2053621622012350436343/