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’.
LANGUAGE: JAVA
CHALLENGE:
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.
SOLUTION:
public class ReadWrite extends ReadOnly { public ReadWrite(int initialValue){ super(initialValue); } private boolean modified = false; public void setVal(int x) { val = x; modified = true; } public boolean isDirty() { return modified; } }
Posted in Java, Learn To Code