我是
Java的初学者.我正在编写这个程序,以显示用户提供的数字之间的所有素数.
目前的输出是：
2,3,5,7,Count: 4
但是,我希望输出如下：
“素数的数量是：”count“,它们是：”后面跟逗号分隔的所有数字
package com.example.test;
import java.util.Scanner;
public class PrimeTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(system.in);
System.out
.println("Enter the number till which the prime numbers are to be calculated: ");
int input = scanner.nextInt();
int count = 0;
// loop through the numbers one by one
for (int i = 2; i < input; i++) {
boolean isPrimeNumber = true;
// check to see if the number is prime
for (int j = 2; j < i; j++) {
if (i % j == 0) {
isPrimeNumber = false;
break; // exit the inner for loop
}
}
// print the number if prime
if (isPrimeNumber) {
count++;
System.out.print(i + ",");
}
}
System.out.println("Count: " + count);
}
}
解决方法
您必须存储值,例如：
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class PrimeTest {
public static void main(String[] args) {
Scanner scanner = new Scanner(system.in);
System.out.println("Enter the number till which the prime numbers are to be calculated: ");
int input = scanner.nextInt();
List<Integer> primes = new ArrayList<>();
// loop through the numbers one by one
for (int i = 2; i < input; i++) {
boolean isPrimeNumber = true;
// check to see if the number is prime
for (int j = 2; j < i; j++) {
if (i % j == 0) {
isPrimeNumber = false;
break; // exit the inner for loop
}
}
// print the number if prime
if (isPrimeNumber) {
primes.add(i);
}
}
System.out.println("The number of prime is: " + primes.size() + ",and they are: " + primes.toString());
}
}