Q1 . who bought Java recently?

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SOLUTION

Java was bought by Oracle corporation from Sun microsystems.

Q2 . Why java does not use pointers?

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SOLUTION

Pointers use the memory location directly and also show the actual address this can lead to malicious manipulation of the data .This is the main reason for java avoiding pointer thereby making it robust.

Q3 . what is the differnce between Abstract class and interface?

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SOLUTION

Abstract classes are classes defined with an abstract keyword and interfaces are with interface

Abstract classes can have all types of varibles like static or non static where as interfaces can only static and final variables.

Q4 . What is the differnce between structures and class?

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SOLUTION

Java does not support structures.So let us compare structures and classes in general.

In structures all the members are of public visibility and classes have them as private.

Classes can be inherited whereas structures cannot.

Q5 . what are the access modifiers in java?

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SOLUTION

Access modifiers decide the visibility and accessablility of various data members and functions in a class.the access specifiers are

>private-members can be accessed only by the same class members

>public can be used by any of the functions

>protect

Q6 . what is the use of an ternary operator?

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SOLUTION

It is a conditional operator. Example

k< 1 ? a : b

the first part is the conditional K<1 depending on that a or b will be returned

if condition is true a is returned or else b is returned.

Q7 . What is the use of instanceof() operator?

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SOLUTION

it is used to check if an instance belongs to specific type like a class .The instanceof() function returns a true or false depeding on if it is of that type or not.

Q8 . what are the iterative and flow control statements in Java?

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SOLUTION

Java support iterative statements like

for loop

while loop

do while loop

It support flow control statements like

if else()

switch() statement.

Q9 . Does java support goto?

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SOLUTION

Java does not support goto.

Q10 . what is a method?

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SOLUTION

Methods are group of instruction that can be invoked by a single name .let us take an example

public int func(int a){}

In this method

public is the access modifier

int is the return type of the function

func is the name of the function

int a is the p

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