swing - Popupmenu wont work in java? -


i constructing word processor program assignment java class in school , having hard time getting popupmenu work when right click on text area. have constructed popup menu , have textarea listening popuplistener , have overridden mouse pressed , mouse released functions 

class popupframe extends jframe{ jmenuitem copy; jmenuitem paste; jtextarea textarea = new jtextarea(); jpopupmenu pop; popupframe(){ container cpane = getcontentpane(); setsize(300 , 300); setlocation(300, 300); settitle("test"); jpopupmenu pop = new jpopupmenu(); copy = new jmenuitem("copy"); paste = new jmenuitem("paste"); textarea = new jtextarea("something goes here", 5, 5); pop.add(copy); pop.add(paste); popuplistener popuplistener = new popuplistener(); textarea.addmouselistener(popuplistener);  }  class popuplistener extends mouseadapter{     public void mousepressed(mouseevent e){         popit(e);     }     public void mousereleased(mouseevent e){         popit(e);     }     private void popit(mouseevent e){         if(e.ispopuptrigger()){             pop.show(e.getcomponent(), e.getx(), e.gety());         }     } } }

i cannot see why not working perhaps missing crucial, please help!! appreciated

add @override annotation methods think overriding...

class popuplistener extends mouseadapter {      @override     public void mousepressed(mouseevent e) {         system.out.println("pressed");         popit(e);     }      @override     public void mousereleased(mouseevent e) {         system.out.println("pressed");         popit(e);     }

you find fails compile, why? because java case sensitive, , convention, method names start lower case character

you'll find like...

class popuplistener extends mouseadapter {      @override     public void mousepressed(mouseevent e) {         popit(e);     }      @override     public void mousereleased(mouseevent e) {         popit(e);     }      @override     public void mouseclicked(mouseevent e) {         popit(e);     }      private void popit(mouseevent e) {         if (e.ispopuptrigger()) {             pop.show(e.getcomponent(), e.getx(), e.gety());         }     } }

will work better. having said that, you'll find

textarea.setcomponentpopupmenu(pop);

significantly easier , less error prone (and won't cause nullpointerexception example code will.


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