public class Text {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个正整数n");
int n = sc.nextInt();
for (int i = 2; i <= n; i++) {
boolean flag = true;
for (int j = 2; j <i; j++) {
if(i%j==0){
flag = false;
continue;
}
}
if(flag){
System.out.print(i+" ");
}
}
}
}
举例: