关于java Scanner 输入无法结束的问题

</pre><pre name="code" class="java">import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main{
public static void main(String[] args) throws IOException{
Scanner input = new Scanner(System.in);
ArrayList<Integer> ns = new ArrayList<Integer>();
while (input.hasNextInt()) {
ns.add(input.nextInt());
System.out.println(ns.size());
}
}

}