java util.Scanner

package com.company;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int i = sc.nextInt();
        System.out.println(i*5);
        sc.close();
    }
}

package com.company;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        getTyping();
    }

    public static void getTyping(){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNextInt()){
            System.out.println("You input "+sc.nextInt());
        }
        sc.close();
    }
}

// 이런식으로 boolean method를 사용하여 입력을 누적할 수 있다.