BigInteger类isProbablePrime()方法 (BigInteger Class isProbablePrime() method)

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

  isProbablePrime()方法在java.math包中可用。

• isProbablePrime() method is used to check whether this BigInteger is probable prime or not.

  isProbablePrime()方法用于检查此BigInteger是否为可能的素数。

• isProbablePrime() 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.

  isProbablePrime()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。

• isProbablePrime() method does not throw an exception at the time of checking probable prime.

  在检查可能的素数时， isProbablePrime()方法不会引发异常。

Syntax:

句法：

    public boolean isProbablePrime(int probability);

Parameter(s):

参数：

• int probability – represents the probability of being prime when probability <= 0.

  整数概率 –表示当概率<= 0时成为素数的概率。

Return value:

返回值：

The return type of this method is boolean, it returns true when this BigInteger is probably prime otherwise it returns false.

此方法的返回类型为boolean ，当此BigInteger可能为素数时返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example 
// of boolean isProbablePrime(int probability) method  of BigInteger
import java.math.*;
public class IsProbablePrimeOfBI {
public static void main(String args[]) {
// Initialize two variables str1 and str2
String str1 = "13";
String str2 = "6";
// Initialize two BigInteger objects  
BigInteger b_int1 = new BigInteger(str1);
BigInteger b_int2 = new BigInteger(str2);
// checks whether this BigInteger
// b_int1 value is prime or not , here the
// value of b_int1 is 13 so it returns true
// because 13 is prime
boolean status = b_int1.isProbablePrime(2);
System.out.println("b_int1: " + b_int1);
System.out.println("b_int1.isProbablePrime(2): " + status);
System.out.println();
// checks whether this BigInteger
// b_int2 value is prime or not , here the
// value of b_int2 is 6 so it returns false
// because 6 is not prime (i.e. composite)
status = b_int2.isProbablePrime(2);
System.out.println("b_int2: " + b_int2);
System.out.println("b_int2.isProbablePrime(1): " + status);
System.out.println();
// checks whether this BigInteger
// b_int2 value is prime or not , here the
// value of b_int2 is 6 so it returns true
// because 6 is not prime (i.e. composite) but
// the given parameter value is -2 i.e. < 0 and
// when the given parameter value <=0 so it 
// returns true even the value of b_int2 is composite
status = b_int2.isProbablePrime(-2);
System.out.println("b_int2: " + b_int2);
System.out.println("b_int2.isProbablePrime(-2): " + status);
}
}

Output

输出量

b_int1: 13
b_int1.isProbablePrime(2): trueb_int2: 6
b_int2.isProbablePrime(1): falseb_int2: 6
b_int2.isProbablePrime(-2): true

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