View Code of Problem 1

package chapter1;

import java.util.Scanner;

public class A_B_add {
	static Scanner in = new Scanner(System.in);

	public static void main(String[] args) {
		int a = in.nextInt(), b = in.nextInt();
		System.out.println(a + b);
	}
}

/*
Main.java:5: error: class A_B_add is public, should be declared in a file named A_B_add.java
public class A_B_add {
       ^
1 error
*/