How do you get the screen width in java?

java.awt.Toolkit.getDefaultToolkit().getScreenSize()

The working area is the desktop area of the display, excluding taskbars, docked windows, and docked tool bars.

If what you want is the "working area" of the screen, use this:

public static int GetScreenWorkingWidth() {
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width;
}

public static int GetScreenWorkingHeight() {
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height;
}