[Java self-study] Double prime number, java Prime Number

[Java self-study] Double prime number, java Prime Number

1 package codeTask_FangFa; 2 // 5.30 double prime number is two prime numbers with a difference of 2. The program displays all the double prime numbers smaller than 1000. Display by format. 3 public class ShuangSuShu {4 public static void main (String [] args) {// the so-called main method; 5 int number = 3; 6 int first = 2; 7 System. out. println ("the double prime number less than 1000 is:"); 8 while (number <1000) {9 if (isSuShu (number) {10 int second = number; 11 if (second-first = 2) {12 System. out. println ("(" + first + "," + second + ")"); 13} 14 first = second; 15} 16 number ++; 17} 18} 19 20 public static boolean isSuShu (int number) {// determine whether the prime number is used; 21 for (int divisor = 2; divisor <= number/2; divisor ++) {22 if (number % divisor = 0) 23 return false; 24} 25 return true; 26} 27 28}