代码实现十进制转换为二进制、十六进制（源码）

class Demo
{
 public static void main(String[] args) {
  toBin(60);
  toOct(60);
  toHex(60);
 }

 public static void toBin(int num) {
  trans(num, 1, 1, "二进制");
 }

 public static void toOct(int num) {
  trans(num, 7, 3, "八进制");
 }

 public static void toHex(int num) {
  trans(num, 15, 4, "十六进制");
 }

 public static void trans(int num, int base, int offset, String name) {
  System.out.print(name + ":");
  char[] chs = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
    'B', 'C', 'D', 'E', 'F' };

  char[] arr = new char[32];

  int pos = arr.length;

  while (num != 0) {
   int temp = num & base;
   arr[--pos] = chs[temp];
   num = num >>> offset;
  }

  for (int x = pos; x < arr.length; x++) {
   System.out.print(arr[x]);
  }
  System.out.println();
 }
}

 

 

 

 

Java 中的简易方式：

 

String bin = Integer.toBinaryString(35); //二进制 toBinaryString(int i)
            //八进制 toOctalString(int i)
            //十六进制 toHexString(int i)
  System.out.println(bin);
  
  int parseInt = Integer.parseInt(bin,2);
  System.out.println(parseInt);