Question

java求素数后，怎么把它放进新数组

Answer 1

public class Test
{
public static void main(String[] args)
{
int i,j,len=0;
int[] arr=new int[100];

for(i=2;i<=100;i++)
{
for(j=2;j<i;j++)
if(i%j==0)
break;
if(j>=i)
arr[len++]=i;
}
System.out.print("1至100之间的素数有：");
for(i=0;i<len-1;i++)
System.out.printf("%d,",arr[i]);
System.out.println(arr[len-1]);
}
}

Answer 2

public static void main(String[] args) {
ArrayList<Integer> list = new ArrayList<Integer>();
for (int i = 2; i <= 100; i++) {
int count = 0;
b:for (int j = 1; j <= i; j++){
if(i%j == 0) {
count++;
}
if(count > 2){
break b;
}
}
if(count==2){
list.add(i);
}
}
//装素数的一维数组
Object[] array = list.toArray();
}