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Q:

What will be the output of the following code snippet?

Object s1 = new String("Hello");
Object s2 = new String("Hello");
 
if(s1 == s2) {
  System.out.println("s1 and s2 are ==");
}else if (s1.equals(s2)) {
  System.out.println("s1 and s2 are equals()");
}

Answer

Answer : s1 and s2 are equals()


 


Explanation :



 

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Subject: Java

Q:

What is the difference between method overriding and overloading?

Answer

Overriding is a method with the same name and arguments as in a parent, whereas overloading is the same method name but different arguments

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Subject: Java

Q:

What is the impact of declaring a method as final?

Answer

A method declared as final can't be overridden. A sub-class can't have the same method signature with a different implementation.

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Subject: Java

Q:

What is the difference between creating a thread by extending Thread class and by implementing Runnable interface? Which one should prefer?

Answer

When creating a thread by extending the Thread class, it is not mandatory to override the run method (If we are not overriding the run method , it is useless), because Thread class have already given a default implementation for run method. But if we are implementing Runnable , it is mandatory to override the run method. The preferred way to create a thread is by implementing Runnable interface, because it give loose coupling.

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Subject: Java

Q:

What are the the different ways for creating a thread?

Answer

A thread can be created by subclassing Thread, or by implementing the Runnable interface.

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Subject: Java

Q:

What are the restrictions when overriding a method ?

Answer

Overridden methods must have the same name, argument list, and return type (i.e., they must have the exact signature of the method we are going to override, including return type.)


The overriding method cannot be less visible than the method it overrides( i.e., a public method cannot be override to private).


The overriding method may not throw any exceptions that may not be thrown by the overridden method

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Subject: Java

Q:

The benefits of object-oriented modeling are which of the following?

A) The ability to tackle more challenging problems B) Reusability of analysis, design, and programming results
C) Improved communication between users, analysts, etc. D) All of the above.
 
Answer & Explanation Answer: D) All of the above.

Explanation:
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Filed Under: Database

Q:

 A proxy server is used for which of the following?

A) To provide security against unauthorized users B) To process client requests for Web pages
C) To process client requests for database access D) To provide TCP/IP
 
Answer & Explanation Answer: A) To provide security against unauthorized users

Explanation:
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Filed Under: Database