Java Math BigInteger.toByteArray() 方法

package com.codingdict;



import java.math.*;



public class BigIntegerDemo {



   public static void main(String[] args) {



      // create 2 BigInteger objects

      BigInteger bi1, bi2;



      // create 2 byte arrays

      byte b1[], b2[];



      // create and assign value to byte array b3

      byte b3[] = { 0x1, 0x00, 0x00 };



      bi1 = new BigInteger("10");

      bi2 = new BigInteger(b3); // using byte[] constructor of BigInteger



      // assign byte array representation of bi1, bi2 to b1, b2

      b1 = bi1.toByteArray();

      b2 = bi2.toByteArray();



      String str1 = "Byte array representation of " + bi1 + " is: ";



      System.out.println( str1 );



      // print byte array b1 using for loop

      for (int i = 0; i  < b1.length; i++) {

         System.out.format("0x%02X\n", b1[i]);

      }



      String str2 = "Byte array representation of " + bi2 + " is: ";



      System.out.println( str2 );



      // print byte array b2 using for loop

      for (int j = 0; j < b2.length; j++) {

         System.out.format("0x%02X ", b2[j]);

      }

   }

}