整數類numberOfLeadingZeros()方法 (Integer class numberOfLeadingZeros() method)

• numberOfLeadingZeros() method is available in java.lang package.

  在java.lang包中提供了numberOfLeadingZeros()方法 。

• numberOfLeadingZeros() method is used to returns the number of 0's bits preceding the leftmost one bit in the 2's complement of the given parameter [value] of integer type. Otherwise, it returns 32 if the given parameter value is 0.

  numberOfLeadingZeros()方法用于返回整數類型的給定參數[value]的2的補碼中最左一位之前的0位數。 否則，如果給定參數值為0，則返回32。

• numberOfLeadingZeros() method is a static method, it is accessible with the class name too and if we try to access the method with the class object then also we will not get an error.

  numberOfLeadingZeros()方法是一個靜態方法，也可以使用類名進行訪問，如果我們嘗試使用類對象訪問該方法，那么也不會出錯。

• numberOfLeadingZeros() method does not throw an exception.

  numberOfLeadingZeros()方法不會引發異常。

Syntax:

句法：

public static int numberOfLeadingZeros (int value);

Parameter(s):

參數：

• int value – represents the integer value to be parsed.

  int value –表示要解析的整數值。

Return value:

返回值：

The return type of this method is int, if the given argument is non-zero then, it returns the number of 0's bits preceding the leftmost one bit of the given int value. Else, if the given argument is zero then, it returns the value 32.

此方法的返回類型為int ，如果給定參數不為零，則它返回給定int值的最左一位之前的0位數。 否則，如果給定參數為零，則返回值32。

Example:

例：

// Java program to demonstrate the example // of numberOfLeadingZeros (int value) method of Integer classpublic class NumberOfLeadingZerosOfIntegerClass {public static void main(String[] args) {int value1 = 1296;int value2 = 0;// It returns the string representation of the given unsigned // integer value denoted by the argument in binary by calling// Integer.toBinaryString(value1)System.out.println("Integer.toBinaryString(value1): " + Integer.toBinaryString(value1));// It returns the string representation of the given unsigned // integer value denoted by the argument in binary by calling// Integer.toBinaryString(value2)System.out.println("Integer.toBinaryString(value2): " + Integer.toBinaryString(value2));// It returns the number of 0's bits preceding the leftmost side // one bit in the given argument 'value' by calling // Integer.numberOfLeadingZeros(value1)System.out.println("Integer.numberOfLeadingZeros(value1): " + Integer.numberOfLeadingZeros(value1));// It returns the value 32 because the value of // the given argument is zero System.out.println("Integer.numberOfLeadingZeros(value2): " + Integer.numberOfLeadingZeros(value2));} }

Output

輸出量

Integer.toBinaryString(value1): 10100010000 Integer.toBinaryString(value2): 0 Integer.numberOfLeadingZeros(value1): 21 Integer.numberOfLeadingZeros(value2): 32

翻譯自: https://www.includehelp.com/java/integer-class-numberofleadingzeros-method-with-example.aspx

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