BigInteger类modInverse()方法 (BigInteger Class modInverse() method)

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

  modInverse()方法在java.math包中可用。

• modInverse() method is used to calculate the mod inverse by using the inverse of (this BigInteger) mod the given BigInteger (val).

  modInverse()方法用于通过使用给定BigInteger(val)的(this BigInteger)mod的逆来计算mod逆。

• modInverse() 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.

  modInverse()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• modInverse() method may throw an exception at the time of returning mod inverse.

  在返回mod逆时， modInverse()方法可能会引发异常。

  ArithmeticException: This exception may throw when the given parameter holds value 0 or negative.

  ArithmeticException ：当给定参数的值为0或负数时，可能引发此异常。

Syntax:

句法：

    public BigInteger modInverse(BigInteger val);

Parameter(s):

参数：

• BigInteger val – represents the object by which to calculate mod inverse.

  BigInteger val –表示计算逆模的对象。

Return value:

返回值：

The return type of this method is BigInteger, it returns the mod inverse value by using [ inv (this BigInteger) mod (BigInteger val) ].

此方法的返回类型为BigInteger ，它通过使用[inv(this BigInteger)mod(BigInteger val)]返回mod逆值。

Example:

例：

// Java program to demonstrate the example 
// of BigInteger modInverse(BigInteger val) method of BigInteger
import java.math.*;
public class ModInverseOfBI {
public static void main(String args[]) {
// Initialize three variables str1 , str2 and str3
String str1 = "101";
String str2 = "13";
String str3 = "10";
// Initialize three BigInteger objects  
BigInteger b_int1 = new BigInteger(str1);
BigInteger b_int2 = new BigInteger(str2);
BigInteger b_int3 = new BigInteger(str3);
// Display b_int1 , b_int2 and b_int3
System.out.println("b_int1: " + b_int1);
System.out.println("b_int2: " + b_int2);
System.out.println("b_int3: " + b_int3);
System.out.println();
// Here, we are calculating modInverse between
// two BigInteger values [inv(this BigInteger
// b_int1) mod (BigInteger b_int3) ] by using
// modInverse(BigInteger) method
BigInteger modinv_val = b_int1.modInverse(b_int3);
System.out.println("b_int1.modInverse(b_int3): " + modinv_val);
// Here, we are calculating modInverse between
// two BigInteger values [inv(this BigInteger
// b_int2) mod (BigInteger b_int3) ] by using
// modInverse(BigInteger) method
modinv_val = b_int2.modInverse(b_int3);
System.out.println("b_int2.modInverse(b_int3): " + modinv_val);
}
}

Output

输出量

b_int1: 101
b_int2: 13
b_int3: 10b_int1.modInverse(b_int3): 1
b_int2.modInverse(b_int3): 7

翻译自: https://www.includehelp.com/java/biginteger-modinverse-method-with-example.aspx