CODEWITHSUNDEEP
javaparametersactionlistener
Jack98
Jack98

Reputation: 57

Calling a Method That Takes a Parameter Within ActionListener

I've encountered a problem while trying to call a method within a class that implements actionListener. The method being called, DataCompiler, needs to use the integer wordCountWhole, which is returned in the wordCount class. The problem is that I can't pass the required parameter to the actionListener method.

 import javax.swing.*;
 import java.awt.*;
 import java.awt.List;
 import java.awt.event.*;
 import java.beans.PropertyChangeListener;
 import java.text.BreakIterator;
 import java.util.*;
 import java.util.stream.IntStream;

 public class GUI extends JFrame {
     public JTextArea textInput;
     public JButton dataButton;
     public String str;

     public GUI() {
         super("Text Miner");
         pack();
         setLayout(null);

         dataButton = new JButton("View Data"); //Button to take user to data table
         dataButton.setSize(new Dimension(120, 50));
         dataButton.setLocation(5, 5);
         Handler event = new Handler(); //Adds an action listener to each button
         dataButton.addActionListener(event);
         add(dataButton);

         public class wordCount {
             public int miner() {
                 //This returns an integer called wordCountWhole
             }
         }

         public class Handler implements Action { //All the possible actions for when an action is observed

             public void action(ActionEvent event, int wordCountWhole) {

                 if (event.getSource() == graphButton) {
                     Graphs g = new Graphs();
                     g.Graphs();
                 } else if (event.getSource() == dataButton) {
                     DataCompiler dc = new DataCompiler();
                     dc.Data(wordCountWhole);
                 } else if (event.getSource() == enterButton) {
                     wordCount wc = new wordCount();
                     sentenceCount sc = new sentenceCount();
                     wc.miner();
                     sc.miner();
                 }
             }
         }
     }

And here's the code for the DataCompiler class:

public class DataCompiler{
    public void Data(int wordCountWhole){
        int m = wordCountWhole;
        System.out.println(m);
    }
}

Upvotes: 0

Views: 873

Answers (1)

OneCricketeer
OneCricketeer

Reputation: 191701

You don't add the parameter there because you've invalidated the contract of the interface.

Use a constructor* (see note below, first) 

public class Handler implements Action{ //All the possible actions for when an action is observed

    private int wordCountWhole;

    public Handler(int number) { this.wordCountWhole = number; } 

    @Override 
    public void actionPerformed(ActionEvent event) {

Although, it isn't entirely clear why you need that number. Your DataCompiler.Data method just prints the number passed into it, and that variable seemingly comes from nowhere in your code because it is not passed to the ActionListener.

* You should instead use Integer.parseInt(textInput.getText().trim()) inside Handler class / the listener code and not use a constructor. Otherwise, you'd always get the number value when you add the Handler, which would be an empty string and throw an error because the text area has no number in it.

Additionally, wc.miner(); returns a value, but calling it on its own without assigning it to a number just throws away that return value.

Upvotes: 1

Related Questions