Java Math BigInteger.bitLength() 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 int objects

      int i1, i2;



      // assign values to bi1, bi2

      bi1 = new BigInteger("7"); 

      bi2 = new BigInteger("-7"); 



      // perform bitlength operation on bi1, bi2

      i1 = bi1.bitLength();

      i2 = bi2.bitLength();



      String str1 = "Result of bitlength operation on " + bi1 +" is " +i1;

      String str2 = "Result of bitlength operation on " + bi2 +" is " +i2;



      // print i1, i2 values

      System.out.println( str1 );

      System.out.println( str2 );

   }

}