Part $1$:

For this assignment, your Item class must also implement the Comparable interface. Example: public class Circle implements Comparable

Add the Comparable.compareTo$(...)$ method $($below$)$ to your class so you can sort Items.

$$ public int compareTo$($ Item o $)-$ Compares this Item to the Item passed in the argument. This method returns either a negative integer, zero, or a positive integer based on whether the argument Item is less than, equal to$,$ or larger than the current Item, respectively.

Then

c$1.$compareTo$($c$2)$ returns a negative int because red is equal to Red and

c$3.$compareTo$($c$2)$ returns a negative int because Blue $$ red in alphabetical order ignoring the case.

Part $2$: Implement two subclasses that extend your Item class, we$$ll call them ItemA and ItemB here. Implement them as follows:

Instance Variables:

$$ Give your ItemA subclass one instance variable that is a private String.

$$ Give your ItemB subclass one instance variable that is a private Boolean.

Constructors: $(1)$ public ItemA$($ String s$,$ Integer n$1,$ Integer n$2)$ is a constructor where n$1$ is the argument for the parent Item class, and n$2$ is the Integer for the ItemA subclass. $(2)$ public ItemB$($ String s$,$ Integer n$1,$ Boolean n$2)$ is a constructor where n$1$ is the argument for the parent Item class, and n$2$ is the Integer for the ItemB subclass.

Methods: Implement a public getter and setter for each new instance variable. $(1)$ public String toString$()-$ Returns a String representation of the object where all instance variables are on one line and are separated by tabs$.$ This method must call the toString$()$ method of Item. Do not include any text in the String other than the values of the instance variables. $(2)$ public boolean equals$($ItemA a$)-$ Calls the equals method from Item first and, if true, it checks the equality of ItemA$$s Integer instance variable. $(3)$ public boolean equals$($ItemB b$)-$ Calls the equals method from Item first and, if true, it checks the equality of ItemB$$s Boolean instance variable.

The rest of the worksheet are in the pictures.