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轉換為一個字節[]，該字節持有此BigInteger的2的補碼表示，并且數組容量足以用一個額外的符號表示此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。
testBit() method does not throw an exception at the time of converting this object to a byte array.
在將此對象轉換為字節數組時， testBit()方法不會引發異常。
Syntax:
句法：
public byte[] toByteArray();
Parameter(s):
參數：
None
沒有
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 [] ，它以字節數組中2的補碼形式表示此BigInteger。
Example:
例：
// Java program to demonstrate the example
// of byte[] toByteArray() method of BigInteger
import java.math.*;
import java.util.*;
public class ToByteArrayOfBI {
public static void main(String args[]) {
// Initializes a variable str
String 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 BigInteger
byte[] 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
