#Help with using JOptionPane class

1 messages · Page 1 of 1 (latest)

dawn lynxBOT
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<@&987246399047479336> please have a look, thanks.

dawn lynxBOT
#

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silk forge
#

A bit vague, does it want you to enter it in the console or a text field?

sonic hamlet
silk forge
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JTextfield, it's like a text box for java guis

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I'm assuming from console because it is asking you to use a Scanner to enter this.

sonic hamlet
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yea I think so

silk forge
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import java.util.Scanner;

public class Input {

    private String name;
    private int salary;

    public Input() {
        Scanner scn = new Scanner(System.in);

        System.out.println("What is your name? ");

        name = scn.nextLine();

        System.out.println("What is your salary? ");

        salary = scn.nextInt();

    }


    public String getName() {
        return name;
    }

    public int getSalary() {
        return salary;
    }
}
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here is the input class.

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import javax.swing.JOptionPane;

public class Display {
    
    public static void main(String[] args) {

        Input input = new Input();


        JOptionPane.showMessageDialog(null, input.getName() + "'s salary is: $" + input.getSalary());


    }
}
#

So basically, you create a support class that uses a Scanner in the default constructor to set the private datafields of the class to chosen values.

sonic hamlet
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sorry, what is a constructor?

silk forge
#

A default constructor is like the default method of a class, when you create an instance of that class, that default constructor is "executed" if you may.

sonic hamlet
#

okay

silk forge
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Input input = new Input(); <--- this line we are creating an instance object of that class called "input"

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so it runs this:

    public Input() {
        Scanner scn = new Scanner(System.in);

        System.out.println("What is your name? ");

        name = scn.nextLine();

        System.out.println("What is your salary? ");

        salary = scn.nextInt();

    }

asks the user to enter these details

sonic hamlet
#

im sorry I am just having trouble following

silk forge
#

It seems that they want you to use multi classes so you should already be familiar with the ideas of constructors and methods.

sonic hamlet
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yea

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the class is moving so fast I really dont know what is going on at this point

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so i just feel screwed

silk forge
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What part is confusing you.

sonic hamlet
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like

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i dont know where to start

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sorry

silk forge
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You have to start somewhere.

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Basically, java follows this convention called encapsulation meaning that the access to data in classes should be controlled.

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If you look in the Input class, we created two datafields, name and salary

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but they are private so we can't access them outside of the class.

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So we have to write 2 methods, getName() and getSalary() to be able to retrieve these values.

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as you can see, the two methods specified have the "public" prefix so we can use them outside of the class.

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Our Input class doesn't have a main method so it is referred to as a "support" class because it is not running the program but providing code for the class Display which has the main method.

sonic hamlet
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okay thank you, I appreciate the help, I have to go now

dawn lynxBOT
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Closed the thread.