help adding actionlisteners

[Wrathchild]

can sombody help me with how to add actionlisteners to the items I'm adding to the menu? thanks!

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class ApplicationList3 extends JFrame
{
    public ApplicationList3 ()
    {
        super ("Launcher");
        setSize (150, 50);
        setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        
        //Store every application name in an array
        String AppNames[] = { "App1", "App2", "App3", "App4" };
        
        //Store every application path in an array
        File[] AppPaths = new File[5];
        
        AppPaths[0] = new File("http:test.jsp");
        AppPaths[1] = new File("C:\\test.mde");
        AppPaths[2] = new File("C:\\test2.mdb");
        AppPaths[3] = new File("C:\\test3.mde");
        
        //The third array, AppsLoaded, will only store those apps which are loaded on the machine and
        //menu items will be created from these
        String AppsLoaded[] = new String[5];
        
        //add applications that everybody has; don't need to check for
        AppsLoaded[0] = "App1";
        
        int i;
        for(i=1;i<4;i++){ //don't check App1, it's a web application, so everybody has it, so start at 1
        if(AppPaths[i].exists()){
            AppsLoaded[i] = AppNames[i];
            System.out.println(AppsLoaded[i]);}
        }
        
        JMenuBar jmb = new JMenuBar ();
        JMenu myMenu  = new JMenu ("Application");
        jmb.add(myMenu);
        JMenuItem [] menulist = new JMenuItem[10];
        
        for (i=0; i < 5; i++) {
        menulist[i] = new JMenuItem(AppsLoaded[i]); 
        myMenu.add(menulist[i]);
        }
        myMenu.addSeparator ();
        myMenu.add("Exit");

        setJMenuBar (jmb);
        setVisible (true);
    }

 

[sjakiePP]

Try it with a tutorial from java.sun.com

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[Wrathchild]

thanks, but I have spent many hours searching online trying to figure it out. The only samples I can find are to add it to an individual object, such as "button.addactionlistener" and I've tried many incarnations with my code but nothings worked. I can't find a tutorial which covers my case, in which I'm looping through a list and adding them. I only post a question after really trying to figure it out.

 

[idarke]

You can have the whole class ApplicationList3 implement the ActionListener interface:

public class ApplicationList3 extends JFrame implements java.awt.event.ActionListener

Each menu item then gets assigned the same listener (ApplicationList3) with the "this" operator:

  menulist[i] = new JMenuItem(AppsLoaded[i]);
  menulist[i].addActionListener(this);

Then create a method called actionPerformed to handle the events:

public void actionPerformed( java.awt.event.ActionEvent event )
{
   String command = event.getActionCommand();
   ...
}

Each menu item should return the menu text as the action command, or you can assign a different action command to each.

 

[sedj]

You just need to add an ActionListener - thats all there is to it ...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;

public class ApplicationList3 extends JFrame implements ActionListener {

	public static void main(String []args) {
		new ApplicationList3();
	}


    public void actionPerformed(ActionEvent e) {
        JMenuItem source = (JMenuItem)(e.getSource());
        System.out.println(source.getText() +" clicked");
	}


    public ApplicationList3 ()
    {
        super ("Launcher");
        setSize (150, 50);
        setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

        //Store every application name in an array
        String AppNames[] = { "App1", "App2", "App3", "App4" };

        //Store every application path in an array
        File[] AppPaths = new File[5];

        AppPaths[0] = new File("http:test.jsp");
        AppPaths[1] = new File("C:\\test.mde");
        AppPaths[2] = new File("C:\\test2.mdb");
        AppPaths[3] = new File("C:\\test3.mde");

        //The third array, AppsLoaded, will only store those apps which are loaded on the machine and
        //menu items will be created from these
        String AppsLoaded[] = new String[5];

        //add applications that everybody has; don't need to check for
        AppsLoaded[0] = "App1";

        int i;
        for(i=1;i<4;i++){ //don't check App1, it's a web application, so everybody has it, so start at 1
        if(AppPaths[i].exists()){
            AppsLoaded[i] = AppNames[i];
            System.out.println(AppsLoaded[i]);}
        }

        JMenuBar jmb = new JMenuBar ();
        JMenu myMenu  = new JMenu ("Application");
        jmb.add(myMenu);
        JMenuItem [] menulist = new JMenuItem[10];

        for (i=0; i < AppsLoaded.length; i++) {
        	menulist[i] = new JMenuItem(AppsLoaded[i]);
        	menulist[i].addActionListener(this);
        	myMenu.add(menulist[i]);

        }
        myMenu.addSeparator ();
        myMenu.add("Exit");

        setJMenuBar (jmb);
        setVisible (true);
    }
}

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[sedj]

Sorry idarke, must have posted the same time

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http://www.primrose.org.uk

 

[Wrathchild]

mucho gracias sedj! looks like I was close...seems I had the listener below the .add(menulist) when it needs to be above

I had the actionperformed stuff at the bottom, but your way is certainly better since there's some variables I was wondering how I was going to reuse.

 

[Wrathchild]

oh, and thanks idarke, looks like you had the same answer...all your replies are very appreciated!