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.

Java Class given below

Explanation:

class ReadOnly

{

protected int val;

public ReadOnly (int arg)

{

val = arg;

}

public int getVal ()

{

return val;

}

}

class ReadWrite extends ReadOnly

{

private boolean dirty;

public ReadWrite (int arg)

{

super (arg);

dirty = false;

}

public void setVal (int arg)

{

val = arg;

dirty = true;

}

public boolean isDirty ()

{

return dirty;

}

}