Must be pressed before pressing the key

I finally managed to get my GraphicsProgram in java to remove a specific GObject on pressing the spacebar.

This is the code:

public void keyPressed(KeyEvent key){
    int space = key.getKeyCode();
    if (space == KeyEvent.VK_SPACE){
        remove(welcome);
    }
}

      

        
        
        
      

    

The problem is that if I run my program, it doesn't recognize that I am entering the GraphicsWindow program that is being launched. (It's a bit tricky to explain) Basically, I first have to click inside the window before it recognizes the spacebar being pressed.

If this is not the first time I click on my window, it does not know that I am inside it, and does not recognize the entrance to the spacebar.

So, is there a way for java to open a window (I do this from CMD in windows) in the "front", if you are, immediately prepared to enter a space?

(If this is a Windows OS problem and not a Java problem, then I just need to find a workaround)