Java Long numberOfLeadingZeros()方法
java.lang.Long.numberOfLeadingZeros() 方法返回零位的最高位(“最左侧”)前的数指定long值的二进制补码表示一比特。 它返回64,如果指定的值没有一个比特在它的2的补码表示,换句话说,如果它等于零。
1 语法
public static int numberOfLeadingZeros(long i)
2 参数
i :这是long 值。
3 返回值
此方法返回零位的最高位(“最左侧”)前述中的指定long值的二进制补码表示法,或64一比特的数,如果该值为零。
4 示例
package com.yiidian;
/**
* 一点教程网: http://www.yiidian.com
*/
/**
* Java Long numberOfLeadingZeros()方法
*/
import java.lang.*;
public class LongDemo {
public static void main(String[] args) {
long l = 210;
System.out.println("Number = " + l);
/* returns the string representation of the unsigned long value
represented by the argument in binary (base 2) */
System.out.println("Binary = " + Long.toBinaryString(l));
/* returns a long value with at most a single one-bit, in the position
of the lowest-order ("rightmost") one-bit in the specified int value.*/
System.out.println("Lowest one bit = " + Long.lowestOneBit(l));
/*returns the number of zero bits preceding the highest-order
("leftmost")one-bit */
System.out.print("Number of leading zeros = ");
System.out.println(Long.numberOfLeadingZeros(l));
}
}
输出结果为:
Number = 210
Binary = 11010010
Lowest one bit = 2
Number of leading zeros = 56
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