PLZ help with the following: IN JAVA

The following classes are defined: ELDevice, fridge, Computer, laptop (which is considered as type of computer). ELDevice has one attribute called price (double type). Fridge has two attributes called model (string type) and frequency (double type), computer has one attribute called GPUCode (int type), laptop has one attribute called weight(double type)

a) Analyze the above classes carefully and explain how they relate to each other (specify the base class(es) and derived class(es) and explain the inheritance hierarchy).

b) You are required to write the code of the following two methods (do NOT write any other parts of the classes):

b1) assuming that the ELDevice has constructor that accepts one value to initialize the price of the object. Write a constructor of the fridge class. This constructor however must take advantage. If possible, of the already-written ELDevice constructor.

b2) Write the equal() method of the computer class, which is used to determine whether or not two computer objects are equal (having the same values of all attributes). Your method must be written properly so that it overrides the default equals() method provided by the language.