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8.4

Java and oops

Asked by kesavan_sridhar in Java Programming Language, Microsoft Visual C++, Delphi Components

Tags: oops, aggregation, between, difference

Hi Here are a few java questions:

1)A java class containing a object of some class as one of its attributes is an example of aggregation or just a reference to the object
of the class? Does the concept of containment or aggregation exists in java?

2)Is there any significant difference in runtime between executing a class containing native method and running the same
class with the code of the method written in java itself?

3)How do you pass the constructor parameters for an object of a class "ABC" declared inside some class "xyz" while
creating an object of class xyz(object of class ABC is an attribute of Class ABC)
Could it be done only by passing the required values as parameter to the constructor of class xyz and then calling the
constructor of class ABC with those values? The following code may explain the situation better:

class xyz
{
xyz() { }
ABC objectofABC; //ABC is a class defined somewhere
public void createobject()
objectofABC = new objectofABC(someint1,someint2,someint3)

}

my question is that whether the values someint1,someint2.someint3,should be passed to class xyz constructor as parameters and then these
parameters should be passed to constructor of class ABC OR is there any other way of doing it?

4)Does java provide any class for storing and maintaining a group of data which may be of different types
(somethin like C language's Struct),so that a group of records,each record containing data could be handled?

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20091111-EE-VQP-92

Java and oops

Asked by kesavan_sridhar in Java Programming Language, Microsoft Visual C++, Delphi Components

Tags: oops, aggregation, between, difference

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