JAVA 读取

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String s = input.nextLine();
        System.out.println(s);
        // 1 2 3
        // 1 2 3
        String s = input.next()；//空格自动停止
        System.out.println(s);
        sd 3
        sd
    }
}