Java swing gui memory allocation

Question

Hi I was wondering if there is a way to set a jbutton to do the equivalent of setdefaultcloseoperation(JFrame.DISPOSE_ON_CLOSE) because I dont understand how a frame object is eligible for collection if it still has listeners when the frame is set invisible. I can send code if this doesn't make sense.

Just in the `actionPerformed(...)` method of your so called `JButton` write `frameObject.dispose();`, that will give you, your equivalent behaviour :-) — nIcE cOw, Apr 23 '12 at 05:47

score 2 · Accepted Answer · edited May 23 '17 at 12:03

2

Top Level Containers (JFrame, JDialog ...) miss implemetations for finalize(), then they are never GC'd
equivalent for JFrame.DISPOSE_ON_CLOSE is only setVisible(false)
you can returns all Top Level Containers from method Window[] wins = Window.getWindows();
you can remove only all JComponents from ContentPane, for return used memory back

EDIT

only visible container with Focus can listening or firing events from Swing Listeners

edited May 23 '17 at 12:03

Community

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answered Apr 23 '12 at 05:52

mKorbel

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+1, this info is always true, no one has the power to control GARBAGE COLLECTION :-), but wont' writing dispose(), will atleast make it available for the GC to collect it, though only JVM can tell as to when will that happen. – nIcE cOw Apr 23 '12 at 06:00
ya thats what i thought. so does setVisible(false) leave the frames listeners open? thus not making the frame eligible for gc? – Ben Evans Apr 23 '12 at 07:24
that make sense. just so i know i have understood your edit, is Focus what setVisible(bool) turns on and off? – Ben Evans Apr 23 '12 at 08:25

score 1 · Answer 2 · answered Apr 23 '12 at 05:51

1

addActionListener( new ActionListener(){
            public void actionPerformed(ActionEvent e){
                   myframe.dispose();
                   }
            });

answered Apr 23 '12 at 05:51

ApprenticeHacker

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Java swing gui memory allocation

2 Answers2