%uA0java.math.BigInteger.getLowestSetBit()返回BigInteger最右边的(最低阶)的一个1比特位(零比特到最右边的1位的权数)的索引。如果此BigInteger包含无比特位,它返回-1。它计算(this==0? -1 : log2(this & -this)).
声明
以下是java.math.BigInteger.getLowestSetBit()方法的声明
public int getLowestSetBit()
参数
-
NA
返回值
此方法返回BigInteger最右边的1位的索引。
异常
-
NA
例子
下面的例子显示math.BigInteger.getLowestSetBit()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 // create 2 int objects int i1, i2 // assign values to bi1, bi2 bi1 = new BigInteger("8")//1000 bi2 = new BigInteger("7")//0111 // perform getLowestSetBit on bi1, bi2 i1 = bi1.getLowestSetBit() i2 = bi2.getLowestSetBit() String str1 = "Index of rightmost one bit in " +bi1+ " is " +i1 String str2 = "Index of rightmost one bit in " +bi2+ " is " +i2 // print i1, i2 values System.out.println( str1 ) System.out.println( str2 ) } }
让我们编译和运行上面的程序,这将产生以下结果:
Index of rightmost one bit in 8 is 3 Index of rightmost one bit in 7 is 0