import java.util.Scanner;

public class firstexercise{

public static void main(String[]args){
Scanner scanner=new Scanner(System.in);

int c=0;

System.out.println("Введите первое число.");
int a=scanner.nextInt();
System.out.println("Введите второе число.");
int b=scanner.nextInt();

c=a+b;

System.out.println("Ответ = " + c);

}


}

ы

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There should be no prompt message and output only answer:

import java.util.Scanner;

public class firstexercise{

public static void main(String[]args){
Scanner scanner=new Scanner(System.in);

int c=0;

int a=scanner.nextInt();
int b=scanner.nextInt();

c=a+b;

System.out.println(c);

}


}