BigInteger類shiftLeft()方法 (BigInteger Class shiftLeft() method)

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

  shiftLeft()方法在java.math包中可用。

• shiftLeft() method is used to shift the given number of bits towards the left side in this BigInteger.

  shiftLeft()方法用于將給定數(shù)量的位向此BigInteger中的左側(cè)移動(dòng)。

• shiftLeft() 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.

  shiftLeft()方法是一種非靜態(tài)方法，只能通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• shiftLeft() method may throw an exception at the time of shifting bits.

  shiftLeft()方法在移位位時(shí)可能會(huì)引發(fā)異常。

  ArithmeticException: This exception may throw when the given parameter value holds Integer.MIN_VALUE.

  ArithmeticException ：當(dāng)給定參數(shù)值包含Integer.MIN_VALUE時(shí)，可能引發(fā)此異常。

Syntax:

句法：

public BigInteger shiftLeft(int number);

Parameter(s):

參數(shù)：

• int number – represents the value in bits and when it holds negative value it performs right shift instead of left.

  int number –表示以位為單位的值，當(dāng)它保持負(fù)值時(shí)，它執(zhí)行右移而不是左移。

Return value:

返回值：

The return type of this method is BigInteger, it returns BigInteger that holds the value [(this BigInteger) << (number)].

此方法的返回類型為BigInteger ，它返回保存值[(this BigInteger)<<(number)]的BigInteger。

Example:

例：

// Java program to demonstrate the example // of BigInteger setBit(int pos) method of BigIntegerimport java.math.*; public class SetBitOfBI {public static void main(String args[]) {// Initialize a variable strString str = "10";// Initialize a BigInteger object BigInteger b_int = new BigInteger(str);// Display b_intSystem.out.println("b_int: " + b_int);// Display Binary representation of str System.out.println("Binary Representation of 10: 1010 ");System.out.println();// Here, this method setBit(int) method is used// to set the bit value from "0" to 1" at the// given indices in this BigInteger// b_int and the binary representation of b_int// is 1010 so the bit "1" is set at the given// indices (0) so the new binary representation// is 1011 i.e. 11BigInteger set_bit = b_int.setBit(0);System.out.println("b_int.setBit(0): " + set_bit);System.out.println("Binary Representation of 11: 1011 ");} }

Output

輸出量

b_int: 10 Binary Representation of 10: 1010 b_int.setBit(0): 11 Binary Representation of 11: 1011

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

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