BigInteger類testBit()方法 (BigInteger Class testBit() method)

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

  testBit()方法在java.math包中可用。

• testBit() method is used to convert this BigInteger to a byte [] that holds 2's complement denotation of this BigInteger and the array capacity is enough to represent this BigInteger with one extra bit for the sign.

  testBit()方法用于將該BigInteger轉(zhuǎn)換為一個(gè)字節(jié)[]，該字節(jié)持有此BigInteger的2的補(bǔ)碼表示，并且數(shù)組容量足以用一個(gè)額外的符號(hào)表示此BigInteger。

• testBit() 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.

  testBit()方法是一個(gè)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。

• testBit() method does not throw an exception at the time of converting this object to a byte array.

  在將此對(duì)象轉(zhuǎn)換為字節(jié)數(shù)組時(shí)， testBit()方法不會(huì)引發(fā)異常。

Syntax:

句法：

public byte[] toByteArray();

Parameter(s):

參數(shù)：

• None

  沒(méi)有

Return value:

返回值：

The return type of this method is byte[], it represents this BigInteger in terms of 2’s complement in byte array.

此方法的返回類型為byte [] ，它以字節(jié)數(shù)組中2的補(bǔ)碼形式表示此BigInteger。

Example:

例：

// Java program to demonstrate the example // of byte[] toByteArray() method of BigIntegerimport java.math.*; import java.util.*;public class ToByteArrayOfBI {public static void main(String args[]) {// Initializes a variable strString str = "145";// Initializes a BigInteger object BigInteger b_int = new BigInteger(str);// returns the convert this BigInteger // into a byte[] that contains 2's complement of // this BigIntegerbyte[] b_arr = b_int.toByteArray();for (int i = 0; i < b_arr.length; ++i)System.out.println("b_int.toByteArray(): " + b_arr[i] + " ");} }

Output

輸出量

b_int.toByteArray(): 0 b_int.toByteArray(): -111

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

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