Java MCQ's on Random Java

This test contains 10 questions based on Java.
Each question answered correctly awards you 1 point and each incorrect answer has a penalty of -0.25 points, no points are deducted for unattempted answers.

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You Get +1 for each correct answer and -0.25 for each incorrect answer

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Which of these is not supported by Java ?

Multilevel Inheritence	Multiple Inheritence
Garbage Collection	Data Hiding

B

Java does not support Multiple inheritence. It can be only achieved by making use of the Interfaces.

Which of the following exceptions needs not to be in a try catch block.

ClassNotFound Exception	Arithmatic Exception
FileNotFound Exception	NoClassDefFound Exception

B

We do not need to write a Runtime exceptions in a try-catch block. Arithmatic Exception is an Unchecked Exception while all other are Checked Exceptions

Which of the follwoing is the command to compile a java program ?

javacompile	compile
javac	java c

C

We can compile the java code using javac.

Which of the folowing is a class level variable.

public int a;	public static int a;
public final int a;	public volatile int a;

B

static variables are class level variables. They are not assosiated with any object of the class.

Which of the following method is used to start the execution of a thread.

run()	begin()
start()	execute()

C

To start the execution of the thread we need to call the start() method of the thread. This method will internally call the run() method.

Which of the following always returns the objects in a sorted manner.

HashMap	HashTable
TreeSet	HashSet

C

A Tree set implements Set interface and extends NavigableSet class, thus it always stores and returns the objects in a sorted manner.

What is the return type of hashCode() method of the object class ?

hash	int
Object	String

B

The method hashCode() of the object class return an int value of length 16.

What will be the output of 8 >> 2

8	4
2	1

C

8 is represented as 1000 in binary, >> will shift each bit 2 places to the right, thus it will become 0010 which is equal to 2.

What happens if we call the finalize method on an object.

The object gets ready to be garbage collected.	The object is forced to be garbage collected.
It has nothing to do with garbage collection.	It does not allow the object to be garbage collected.

A

A class to the finalize method tells the garbage collector that the particular object is ready to be garbase collected.

What will be the output of the following program ?

class Test{
   public static void main(String args[]){
      static int a = 20;
      System.out.println(a++);
   }
}

20	21
Compilation Error	None of these

C

The above code will throw a compilation error because we cannot have a static variable inside a method. Static variables are class level methods thus cannot be inside any method.

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