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

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