编写一个最简单的java程序？

import java.util.*;
public class Tester{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(true){
            System.out.print("输入一组数据：");
            String line = sc.nextLine().trim();
            if(!line.matches("^\\d+(\\s+\\d+)*$")){
                System.out.print("输入错误, ");
                continue;
            }
            String[] arr = line.split("\\s+");
            System.out.println(Arrays.toString(arr));
            sc.close();
            break;
        }
    }
}