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Thread: Action not working

  1. #1
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    Angry Action not working

    Hello, i am trying to make a program with a button that outputs Hello World and the error tells me this... Multiple markers at this line
    - firstButton cannot be resolved to a variable
    - The method getSorce() is undefined for the type

    Here is the code
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
     
    public class jframeTest {
    public static void main(String args[]) {
     
    	JFrame emptyWindow = new JFrame("Hello World");
    	emptyWindow.pack();
    	emptyWindow.setSize(550, 750);
    	emptyWindow.setResizable(false);
    	emptyWindow.setLocationRelativeTo(null);
    	emptyWindow.setVisible(true);
    	emptyWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	JPanel panelOne = new JPanel();
    	JButton firstButton = new JButton("Hello World");
    	emptyWindow.add(firstButton);
    	emptyWindow.add(panelOne);
    	panelOne.add(firstButton);
        firstButton.addActionListener(new Action());
     
    	}
     
    public static class Action implements ActionListener {
     
    	public void actionPerformed(ActionEvent e) {
    		if(e.getSorce()==firstButton){
    			System.out.println("It Works");
    		}
     
    	}
     
    }
     
     
    }


  2. #2
    Member Ada Lovelace's Avatar
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    Default Re: Action not working

    firstButton cannot be resolved to a variable
    That error is very descriptive. If it states that the it cannot be resolved to a variable, that
    means one of two things: Either it was not created, or you did create it, but have it in the
    wrong scope. Check to see if the variable exists. After that, check if it was declared in a
    scope that allows it to be accessed.

    Wishes Ada xx
    If to Err is human - then programmers are most human of us all.
    "The Analytical Engine offers a new, a vast, and a powerful language . . .
    for the purposes of mankind
    ."
    Augusta Ada Byron, Lady Lovelace (1851)

  3. #3
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    Default Re: Action not working

    Welcome to the forum! Thanks for taking the time to learn how to post code correctly. If you haven't already, please read this topic to learn other useful info for new members.

    Please observe Java's naming conventions which call for class names to begin with capital letters.

    You also have a typo at line 30:

    if(e.getSorce()==firstButton)

    Update:

    AND, this statement has a purpose:

    emptyWindow.pack();

    You should read the API to understand its purpose, and you may also then see that its purpose is only realized AFTER components have been added. Order often matters.

  4. The Following User Says Thank You to GregBrannon For This Useful Post:

    812d (July 18th, 2014)

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