Sum of Numbers Using Inheritance in Java

 Machine Problem

Write a program that prompts the user to input a positive   integer and it will loop until -1 is given and give the total sum of the   given numbers using Java programming language.

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Program Listing
import java.util.Scanner;

/*
 * Machine Problem
 * 
 * Write a program that prompts the user to input a positive 
   integer and it will loop until -1 is given and give the total sum of the 
   given numbers.
 */

class Sum_All {
	

	int sum=0,data=0;
	 Scanner input = new Scanner(System.in);
	 
	 void input_values()  {
		 System.out.println("\n");
	     System.out.print("\tSum of Numbers Using Inheritance in Java");
	     System.out.println("\n");
		 System.out.print( "Enter Positive Integer (the program exits if the input is -1): ");
		 data = input.nextInt();
	
	 }
}

class Sentinel extends Sum_All {

	 void Process_Data() {
		 while (data != -1) {
			 sum += data;
			 System.out.print("Enter Positive Integer (the program exits if the input is -1): ");
			 data = input.nextInt();
			 }
    } 

	
    void display() {
    	System.out.println();
    	System.out.println("The sum is " + sum+ ".");
		input.close();
    }

    
    
    public static void main(String args[]) {
    	
        Sentinel obj = new Sentinel();
        obj.input_values();
        obj.Process_Data();
        obj.display();
    }
}