CODEWITHSUNDEEP
javaobjectmethodsboolean
user3315017
user3315017

Reputation: 25

Connecting boolean method from another class to main

Beginner to Java here. I've been researching how to do this, but I guess I'm researching the wrong thing.. My program inputs numbers and calculates what the user inputted. I figured out how to connect a different class (the one that calculates everything) to the main class (the one that will just output everything). What I'm finding difficulty on is how to connect a boolean, not a void, method to the main class.

public class Driver
{
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in); //forgot to add scanner
        ExampleClass ex = new ExampleClass();
        System.out.println("Enter numbers  <enter -1 to stop>");

        number = in.nextInt(); //user inputs a number

        boolean inputData = true; //researched about this, but it doesn't work

        ex.inputData(); //doesn't work either
    }
}

second class:

public class ExampleClass
{
    int numberOfThings = 0;
    int number = 0;
    int sum = 0;

    public ExampleClass()
    {
        // constructor
    }

    public boolean inputData(int number)
    {
        if(number >= 0)
        {
            numberOfThings++; 
        }
        else if (number <= 0)
        {
            System.out.println("Out of range");
            return false;
        }

        return true;      
    }
}

I'm pretty sure my if statement needs work, my only question is how do I connect the boolean method to my main class (Driver)? I'm trying to piece together how to connect methods and such before I start my real project.

boolean inputData = true; 
ex.inputData();

does not work.

I just provided an example, my coding isn't complete yet.

update: this worked, posting this in case anyone searching needs this.

boolean inputData = true;

while (inputData) 
{ 
Scanner in = new Scanner(System.in);
number = in.nextInt();
inputData = ex.inputData(in.nextInt());
}

Upvotes: 1

Views: 1878

Answers (2)

Michael Yaworski
Michael Yaworski

Reputation: 13483

Possibly loop until the input is false? I don't really know what you want:

System.out.println("Enter numbers  <enter -1 to stop>");

ExampleClass ex = new ExampleClass();
boolean inputData = true;

while (inputData) { // loop until it's false to keep gaining numbers
    Scanner input = new Scanner(System.in); // to get input
    inputData = ex.inputData(input.nextInt()); // equals the return of inputData
}

Upvotes: 1

Tim B
Tim B

Reputation: 41188

You nearly have it, instead of:

    boolean inputData = true;

    ex.inputData();

do

    Scanner in = new Scanner(System.in);
    boolean inputData = ex.inputData(in.nextInt());

Upvotes: 2

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