Question

Adding a KeyListener class to a org.eclipse.swt.widgets.Text class.
When I enter 'a', I get multiple keyEvents. I’m only expecting one keyEvent.
Why is that.

text.addKeyListener(new KeyAdapter() {
    @Override
    public void keyReleased(KeyEvent keyEvent) {
        super.keyReleased(keyEvent);
        logger.log(Level.INFO, "keyEvent-->" + "\n" +  
                            "character :" + keyEvent.character + "\n" + 
                            "code      :" + keyEvent.keyCode + "\n" +
                            "location  :" + keyEvent.keyLocation + "\n" +
                            "stateMask :" + keyEvent.stateMask + "\n" +
                            "time      :" + keyEvent.time + "\n" +
                            "hashCode  :" + keyEvent.hashCode() + "\n" +
                            "data      :" + keyEvent.data + "\n" +
                            "doit      :" + keyEvent.doit + "\n");
    }
});

Output (after pressing “a” in the keyboard once):

keyReleased
INFO: keyEvent-->
character :a
code      :97
location  :0
stateMask :0
time      :15626510
hashCode  :692735
data      :null
doit      :true

keyReleased
INFO: keyEvent-->
character :a
code      :97
location  :0
stateMask :0
time      :15626510
hashCode  :32967617
data      :null
doit      :true

keyReleased
INFO: keyEvent-->
character :a
code      :97
location  :0
stateMask :0
time      :15626510
hashCode  :2412752
data      :null
doit      :true

keyReleased
INFO: keyEvent-->
character :a
code      :97
location  :0
stateMask :0
time      :15626510
hashCode  :17374804
data      :null
doit      :true

keyReleased
INFO: keyEvent-->
character :a
code      :97
location  :0
stateMask :0
time      :15626510
hashCode  :27668426
data      :null
doit      :true

keyReleased
INFO: keyEvent-->
character :a
code      :97
location  :0
stateMask :0
time      :15626510
hashCode  :25933099
data      :null
doit      :true

Answer 1

You might have added multiple KeyAdapters over the lifetime of that component – try checking by seeing what getKeyListeners().length returns.