GLFW Keyboard Input Registers As Multiple Clicks - opengl

Question

In my current LWJGL application I am using the GLFW window input handler which I have set up a class to handle called Keyboard.java which extends GLFWKeyCallback. I have correctly set up my keyboard input class but when I click on a key if i do not click if fast enough (very quickly) then it registers as multiple clicks. I have presented some documentation below:
Keyboard Class
public class Keyboard extends GLFWKeyCallback {
//Variables
public static boolean keys[] = new boolean[65536];
#Override
public void invoke(long window, int key, int scancode, int action, int mods) {
keys[key] = action == GLFW_PRESS;
}
}
Implementation
public static void handleInput() {
if (Keyboard.keys[GLFW_KEY_SPACE]) {
System.out.println("Space");
glfwPollEvents();
}
}
The above method is implemented in the main game loop and is called once a frame.
Result
Initialised LWJGL Version: 3.1.2 build 29
Space
Space
Space
Space
The above: "Space" should be outputted every time that I click space but when I click it relatively fast, Then i get the above result of many "spaces".
Conclusion: Is it possible for a click of space to be registered only once no matter how long you hold it. Thanks

Answer 1

In your handleInput() function, you are testing to see if Keyboard.keys[GLFW_KEY_SPACE] is true, and if it is, you execute the statement. The problem is that this test only becomes false when you stop hitting space, which could take seconds to happen.
My suggestion: once you tested for Keyboard.keys[GLFW_KEY_SPACE], make it false.
public static void handleInput() {
if (Keyboard.keys[GLFW_KEY_SPACE]) {
Keyboard.keys[GLFW_KEY_SPACE] = false;
System.out.println("Space");
glfwPollEvents();
}
}