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Thread: Need help with ActionListener if-else

  1. #1
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    Default Need help with ActionListener if-else

    New member here and new to Java as well. I'm taking a Java class this semester and I'm having trouble with an assignment.

    I need to create a program that produces a message based on an age within an age range I define. That's where I'm having trouble.
    I've got a JButton setup with an ActionListener but I can't figure out how to do the ActionEvent.

    I want to do an age range of 8-12 years old, 20-30 years old and 40-50 years old and when the JButton is pressed, I want it to display a different message depending on the age.

    Can anyone point me in the right direction?

    Here's what I have so far:
    displayJButton = new JButton();
            displayJButton.setText( "Display Wisdom" );
            displayJButton.setBounds( 100, 42, 280, 21 );
            displayJButton.addActionListener(
                  new ActionListener()
                  {
                      public void actionPerformed(ActionEvent event)
                      {
                          displayJButtonActionPerformed(event);
                      }
                  }
               );   
          contentPane.add( displayJButton );

    And...

    public void displayJButtonActionPerformed(ActionEvent click)
    { 
       String age=ageJTextField.getText();
       if ((age.equals "9"))
     
       displayJLabel.setText("yeah");
    }


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    Default Re: Need help with ActionListener if-else

    It seems you have the button/actionListener portion figured out. Is it that you don't know how to write the code to respond according to the age range? If so, expand the displayJButtonActionPerformed() method to something like:
    int ageNumber = Integer.parseInt( age );
    if ( ageNumber >= 8 && ageNumber < 13 )
    {
        // do the 8  - 12 range thing
    }
    else if ( . . . ) // the next age range
    {
        // and similarly
    }
    else if ( . . . )

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    Default Re: Need help with ActionListener if-else

    Yes, my issue is with JButtonActionPerformed. My textbook is very sparse in this area and I tried several examples I found online but I keep getting errors. I'll try your example. Thank you, really. I've spent all day trying to get this to work.

    Erik

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    Default Re: Need help with ActionListener if-else

    Let us know if you have any problems coding that up and getting the results you need.

    Edit: Start simple, code one of the 'if' clauses and test it to make sure you're on the right track. Since I'm not sure exactly what your problem is, I don't want you to go too far down the wrong path.

  5. #5
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    Default Re: Need help with ActionListener if-else

    Again, many thanks! I should have sought help this morning before wasting all day stumbling around in the dark.

    Just for my future reference here's what ended up working for me:

    public void displayJButtonActionPerformed(ActionEvent click)
    { 
       String age=ageJTextField.getText();
     
       int ageNumber = Integer.parseInt( age );
     
       if ( ageNumber >= 8 && ageNumber < 13 )
    {
        displayJLabel.setText("Goosebumps books are the best!");
    }
       else if (ageNumber >= 13 && ageNumber < 18)
       {
           displayJLabel.setText ("No Dating allowed!");
       }
       else if (ageNumber >= 18 && ageNumber <30)
       {
           displayJLabel.setText ("Best years of my life!");
       }
    }

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