BigInteger類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()方法用于檢查此BigInteger是否為可能的素數。

• 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。

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

  在檢查可能的素數時， isProbablePrime()方法不會引發異常。

Syntax:

句法：

public boolean isProbablePrime(int probability);

Parameter(s):

參數：

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

  整數概率 –表示當概率<= 0時成為素數的概率。

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.

此方法的返回類型為boolean ，當此BigInteger可能為素數時返回true，否則返回false。

Example:

例：

// Java program to demonstrate the example // of boolean isProbablePrime(int probability) method of BigIntegerimport java.math.*; public class IsProbablePrimeOfBI {public static void main(String args[]) {// Initialize two variables str1 and str2String 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 primeboolean 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 compositestatus = b_int2.isProbablePrime(-2);System.out.println("b_int2: " + b_int2);System.out.println("b_int2.isProbablePrime(-2): " + status);} }

Output

輸出量

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

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

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