How Can I Accurately Get Java Swing Window Width and Height Outside a Class?

Get Window Width and Height Outside of the Class

When working with Java Swing, it's often necessary to retrieve the window dimensions for various reasons, such as resizing or repositioning elements. However, calling getWidth() or getHeight() methods outside of the class where they are defined can return inaccurate results, especially when the window is being resized.

To address this issue, one approach is to pass the JPanel instance to the method that requires the window dimensions. By doing so, you can directly access the getWidth() and getHeight() methods from within that method.

For example, consider the following code:

public class MyPanel extends JPanel {

    private int jpWidth;
    private int jpHeight;

    @Override
    public void paint(Graphics g) {
        jpWidth = getWidth();
        jpHeight = getHeight();
        // ...
    }

    public void myMethod() {
        // Now you have access to `jpWidth` and `jpHeight` within this method
    }
}

By passing MyPanel to the myMethod() method, you can ensure that it has access to the updated window dimensions, even when the window is resized.

public class MyOtherClass {

    public void myMethod(MyPanel panel) {
        int panelWidth = panel.getWidth();
        int panelHeight = panel.getHeight();
        // ...
    }
}

This approach allows you to obtain the correct window dimensions from outside of the JPanel class, without having to rely on potentially inaccurate values from within the paint() method.

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