How to create maximize and minimize java swing frame

How to create a window in java that having system screen size/dimension

JFrame frame = new JFrame();

frame.setExtendedState(Frame.MAXIMIZED_BOTH);

Or

Dimension screenDimension = getScreenDimension();

frame.setSize(screenDimension.width,screenDimension.height );

private Dimension getScreenDimension() {

Toolkit toolkit = Toolkit.getDefaultToolkit(); Dimension dimension = toolkit.getScreenSize(); return dimension; }

How to set screen dimension to application window.

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