how to display JFrame in full screen display mode

Question

There is a JFrame, when it in a multi-monitor environment, how to display this JFrame in full screen display? For example, now the JFrame is displaying in monitor 1, when it is going to change to full screen display mode,it must be displayed in the monitor 1; if is displaying in monitor 2,when it is going to change to full screen display mode, it must be displayed in the monitor 2.

Answer 1

Try this,

For Single Screen

Toolkit tool = Toolkit.getDefaultToolkit();
Dimension dim = tool.getScreenSize();
int screenWidth = dim.getWidth();
int screenHeight = dim.getHeight();

For Multiple Screen

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] gs = ge.getScreenDevices();


// Get size of each screen

for (int i=0; i<gs.length; i++) {
    DisplayMode dm = gs[i].getDisplayMode();
    int screenWidth = dm.getWidth();
    int screenHeight = dm.getHeight();
}