java.math.BigInteger.clearBit(int n) 返回一個BigInteger,其值相當於此BigInteger的指定位清零。它計算方法是 (this & ~(1<<n)).
以下是java.math.BigInteger.clearBit()方法的宣告
public BigInteger clearBit(int n)
n - 清除位的指數
此方法返回BigInteger物件的值, this & ~(1<<n)
ArithmeticException - n為負數
下面的例子顯示math.BigInteger.clearBit()方法的用法
package com.yiibai; import java.math.*; public class BigIntegerDemo { public static void main(String[] args) { // create 2 BigInteger objects BigInteger bi1, bi2; // assign value to bi1 bi1 = new BigInteger("7"); // perform clearbit operation on bi1 with index 2 bi2 = bi1.clearBit(2); String str = "Clearbit operation on " +bi1+ " at index 2 gives " +bi2; // print bi2 value System.out.println( str ); } }
讓我們編譯和執行上面的程式,這將產生以下結果:
Clearbit operation on 7 at index 2 gives 3