JSplitPane splitting 50% precisely

Question

In Swing, what\'s the best way to make the JSplitPane to split two jpanels with 50% size each.

It looks like if I don\'t set preferred sizes on the panels it always make

Answer 1

I had a similar problem and I solved it by using a component listener in the parent container and set the divider location on the first resize. Initialise a variable firstResize to true and add this into the parent container constructor:

addComponentListener(new ComponentAdapter(){
    @Override
    public void componentResized(ComponentEvent e) {
        if(firstResize){
            splitPane.setDividerLocation(0.5);
            firstResize = false;
        }
    }
});

This should cause the divider to be centred when the parent container size is first set.