requirement:

Given the class 'ReadOnly' with the following behavior:

• A (protected) integer instance variable named 'val'.

• A constructor that accepts an integer and assigns the value of the parameter to the instance variable 'val'.

• A method name 'getVal' that returns the value of 'val'.

  Write a subclass named 'ReadWrite' with the following additional behavior: Any necessary constructors.

• a method named 'setVal' that accepts an integer parameter and assigns it the the 'val' instance variable.

• a method 'isDirty' that returns true if the setVal method was used to override the value of the 'val' variable.

Code

class ReadWrite extends ReadOnly {
 super(int val);    
   void setVal(int val){this.val = val;}
     boolean isDirty() {if (setVal()(return true)) else return false;}}

More Hints:

• ?     You should be using: modified
• ?     You should be using: private
• ?     You should be using: public