Cannot invoke "getKey()" because "tan element is null but I need to allow null keys

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[harsh gate]

also I cannot use collections framework that's why I created a Pair class with "key" and "value" fields

[tidal perch]

have u heard of preconditions??

public void put(Integer key, Box) {
  if (key == null) throw new IllegalArgumentException("Storage key value may not be null");

  ...
}

or.... but this isnt recommended, code that does nothing for no visible reason is not a good idea

public void put(Integer key, Box) {
  if (key == null) return; //cannot add an element with a null key, ignore

  ...
}

u should have learnt about preconditions how to use them and why they exist when learning about javadoccing ur code

[harsh gate]

I cannot handle null like this

"Method get(null) should return value""

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[tidal perch]

probably an empty box in that case

[harsh gate]

Oh sorry I thought I closed the post and deleted it

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[harsh gate]

the task is solved thanks

[tidal perch]

why do u have multiple asserts in a single test without any goal for the test?

[harsh gate]

the task is solved thanks