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Thread: Passing variable from one class to another

  1. #1
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    Default Passing variable from one class to another

    String user1 = JOptionPane.showInputDialog("Please enter the first user's name"); 
    		JOptionPane.showMessageDialog(null, user1 + " will go first! good luck!");

    and in my other class i have

     
    		public tuna(){
    				super("title bar");
    				setLayout(new FlowLayout());
    				JPanel panel = new JPanel();
    				JPanel panel1 = new JPanel();
    				q1 = new JLabel(user1);
    				a1 = new JButton("A");
    				a2 = new JButton("B");
    				a3 = new JButton("C");
    				a4 = new JButton("D");

    I want whatever the user inputs as 'user1' to be printed in the q1 = new JLabel(user1);

    how would i go about doing this?

    Thanks


  2. #2
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    Default Re: Passing variable from one class to another

    You could pass the String: user1 in the Tuna class's constructor.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Passing variable from one class to another

    Pass the desired value to Tuna's constructor (class names should be capitalized).

    public Tuna( String user1 ) { // the other stuff }

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    Default Re: Passing variable from one class to another

    I'm not sure i follow :S how would I pass the desired value to Tuna's constructor from my other class :S

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    Default Re: Passing variable from one class to another

    When you create an instance of the Tuna class you would pass the String in its constructor the same way the String is passed to the JLabel class's constructor:
    	q1 = new JLabel(user1);  //  pass user1 to JLabel's constructor
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Passing variable from one class to another

    What would i type though?

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    Default Re: Passing variable from one class to another

    Post the code where you create an instance of the Tuna class using the new operator.

    Compare that statement with the code that creates a new instance of the JLabel class in post#5


    See how to code the Tuna class's constructor in post#3
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Passing variable from one class to another

    Quote Originally Posted by kingsta View Post
    What would i type though?
    public Tuna(String yourStringVariableHere){ //unnecessary identifier but just to make it obvious..
         q1 = new JLabel(yourStringVariableHere);
    }

    Passing the string variable passed to your class constructor (Tuna), to the constructor for the JLabel object you are initializing.

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