Answer Posted / b venkat reddy

The "is a" relationship is expressed with inheritance and
"has a" relationship expressed with composition.


Both inheritance and composition allow u to place sub-objects inside your new class.Two main techniques to code reuse are inheritance and composition.

Ex.: IS A ===>> house IS A building

class House {
.....
}
class Building extends House{
......
}

Ex.:HAS A ===>> house HAS A bathroom

class House {
Bathroom b = new Bathroom();
}

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