$1.$Explain carefully what$$null$$means in Java, and why this special value is necessary. $(1$ pts$)$

$2.$ Suppose that$$Kumquat$$is the name of a class and that$$fruit$$is a variable of type$$Kumquat$.$What is the meaning of the statement "fruit $=$ new Kumquat$()$;$"?$ That is$,$ what does the computer do when it executes this statement?$(2$ pts$)$

$3.$ What is meant by the terms$$instance method?$(1$ pts$)$

$4.$Modify the following class so that the two instance variables are$$private$$and there is a getter method and a setter method for each instance variable so that we can access them. $(4$ pts$)$

public class Player $\{$ String name; int score; $\}$

$5.$ Does the code $"$if $($obj$.$equals$($null$))"$ work? Explain. $(2$ pts$)$