Re: Remove JFrame from memory

From:

Lew <lewbloch@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

Thu, 28 Jun 2012 10:23:13 -0700 (PDT)

Message-ID:

<ec8352d5-09ef-4a62-87d3-b72492d251c9@googlegroups.com>

Jesper Johnsen wrote:

How do I remove an object lets say a JFrame from memory?

Stop referring to it, then run out of memory.

I know that the garbage collector handles this - but this simple example =

does not release itself...

java.exe uses 10mb in the first wait stage, this increases to 20mb when t=

he JFrame is shown, but the memory usage never returns to the initial 10mb.=

So the garbage collector never removes the object from memory - why?

Others have answered, but the short version (as you would know from reading=

the documentation vis-=E0-vis garbage collection) is that you haven't run o=
ut of
heap yet.

package jframetest;

import javax.swing.JFrame;

public class JFrameTest {

    public static void main(String[] args) {
        try{
        Thread.sleep(5000);
    }catch(Exception Ex){}
        JFrame frame = new JFrame("Test");

You need to do GUI actions on the Event Dispatch Thread (EDT),
not the main thread.

frame.setVisible(true);

Ditto.

         try{
        Thread.sleep(5000);
    }catch(Exception Ex){}
         frame.setVisible(false);

Ditto.

         frame.dispose();
         frame = null;
    while(1==1){
try{
        Thread.sleep(100);
    }catch(Exception Ex){}
    }
    }

}

--
Lew