java.util.Scanner을 이용하면 키보드를 통한 입력이 가능함
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc1 = new Scanner(System.in);
int a, b;
String str;
a = sc1.nextInt();
b = sc1.nextInt();
str = sc1.next();
System.out.println(a + b);
System.out.println(str);
}
}