BigInteger類的bitCount()方法 (BigInteger Class bitCount() method)

• bitCount() method is available in java.math package.

  bitCount()方法在java.math包中可用。

• bitCount() method is used to count the number of bits in 2’s complement denotation of this BigInteger.

  bitCount()方法用于計算此BigInteger的2的補碼表示形式中的位數。

• bitCount() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  bitCount()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• bitCount() method does not throw an exception at the time of counting bits.

  在對位進行計數時， bitCount()方法不會引發異常。

Syntax:

句法：

public int bitCount();

Parameter(s):

參數：

• None

  沒有

Return value:

返回值：

The return type of this method is BigInteger, it returns number of bits in 2's complement denotation of this BigInteger.

此方法的返回類型為BigInteger ，它返回此BigInteger的2的補碼表示形式的位數。

Example:

例：

// Java program to demonstrate the example // of int bitCount() method of BigIntegerimport java.math.*; public class BitCountOfBI {public static void main(String args[]) {// Initialize two variables str1 and str2String str1 = "10";String str2 = "-4";// Initialize two BigInteger objects BigInteger b_int1 = new BigInteger(str1);BigInteger b_int2 = new BigInteger(str2);System.out.println("b_int1: " + b_int1);System.out.println("b_int2: " + b_int2);// returns the number of bits in 2's complement // representation of this BigInteger b_dec1int bit_count = b_int1.bitCount();System.out.println("b_int1.bitCount(): " + bit_count);// returns the number of bits in 2's complement // representation of this BigInteger b_dec2 and it// may differ from its sign bitbit_count = b_int2.bitCount();System.out.println("b_int2.bitCount(): " + bit_count);} }

Output

輸出量

b_int1: 10 b_int2: -4 b_int1.bitCount(): 2 b_int2.bitCount(): 2

翻譯自: https://www.includehelp.com/java/biginteger-bitcount-method-with-example.aspx

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