Java简便解法，直接从中间开始取
查找组成一个偶数最接近的两个素数
http://www.nowcoder.com/questionTerminal/f8538f9ae3f1484fb137789dec6eedb9
import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()){
int n = sc.nextInt();
int l = n/2;
int r = n/2;
while(l>2 && r<n-2){
if(helper(l) && helper(r) && l+r==n) break;
else {
l--;
r++;
}
}
System.out.println(l);
System.out.println(r);
}
}
private static boolean helper(int n){
if(n<=2) return false;
for(int i=2;i<n;i++)
if(n%i==0) return false;
return true;
}
}