Can't reactivate object after I set it to inactivate

I want to make an object disappear and reappear with a press of a button. Here’s my code: `void Update () {
if (Input.GetKeyDown (“k”)) {
if (bar.active == false) {
bar.SetActive(true);

		}
		if (bar.active == true) {
            bar.SetActive(false);

		}
	}
}` 

When I press “k” it makes the object disappear, but when I press “k” again, it doesn’t reappear. All help appreciated!

the problem is here

 public class test : MonoBehaviour {
public GameObject bar;
void Update () { 

	if (Input.GetKeyDown ("k")) {
		if (bar.active == false) {
			bar.SetActive(true); 
		} 
		if (bar.active == true) { 
			bar.SetActive(false); 
		}
	} 
}
}
}

you used 2 ifs ,so for the first time you can deactive the bar,then if you press K again ,in this line

  if (bar.active == false) {
			bar.SetActive(true); 
		} 

you active the bar but at the next line

  if (bar.active == true) { 
			bar.SetActive(false); 
		}

you are deactiving the bar !!!

so you should change it to this

 public class test : MonoBehaviour {
public GameObject bar;
void Update () { 

	if (Input.GetKeyDown ("k")) {
		if (bar.active == false) {
			bar.SetActive(true); 
		} 
		else if (bar.active == true) { 
			bar.SetActive(false); 
		}
	} 
}
 }

also as that dude said ,you should not attach this srcipt to the bar .because if you press k it will deactive the bar and you cannot use it again.