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IS-A & HAS-A Relationship

 
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HI I'm new is this forum.
I have one doubt,can anybody explain me what is
"IS-A",& "HAS-A" relationship in java.
 
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simply IS-A relationship talks about the classes extends and interfaces implemnts.
class A implements Runnable{
}
class B extends class A{
}

HAS-A relationship
look at this example

Student has a name and age
class Student{
String name;
int age;
}
 
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