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Q841. Can a lock be acquired on a class? How is it different than the object level lock ?

Ans. Yes, a lock can be acquired on the class. Class level lock is applicable on the whole class and hence on all objects of the class whereas the object level lock is applicable on the respective object.

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Q842. What is a compilation unit in Java ?

Ans. Java Source Code File

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Related Questions

Difference between == and .equals() ?

Why is String immutable in Java ?

Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?

What are the difference between composition and inheritance in Java?

Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs

What is a Lambda Expression ? What's its use ?

What are different ways to create String Object? Explain.

Why Char array is preferred over String for storing password?

Does garbage collection guarantee that a program will not run out of memory?

What is the difference between final, finally and finalize() ?

Q843. What is Associativity while evaluating a Java statement ?

Core Java

Ans. Associativity determines whether an expression is evaluated left-right or right-left. When an expression has two operators with the same precedence, the expression is evaluated according to its associativity.

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Q844. Collections is a / an ..

Core Java

a. interface

b. abstract class

c. final class

d. util class

Ans.d. util class

Q845. What will be the output of executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
}
}

Core Java

a. Static Block
Main Method

b. Static Block
Instance Initialization Block
Main Method

c. Static Block
Constructor
Main Method

d. Static Block
Instance Initialization Block
Constructor
Main Method

Ans.a. Static Block
Main Method

Q846. What will be the output upon executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Instance Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
new BuggyBread();
}
}

Core Java

a. Instance Initialization Block
Constructor
Static Block
Main Method

b. Static Block
Instance Initialization Block
Constructor
Main Method

c. Main Method
Static Block
Instance Initialization Block
Constructor

d. Static Block
Main Method
Instance Initialization Block
Constructor

Ans.d. Static Block
Main Method
Instance Initialization Block
Constructor

Q847. What will be the output of exceuting main method ?

public static void main(String[] args){
      List list = new ArrayList();
      list.add(1);
      list.add(2);
      list.add(3);
      System.out.println(list);
   }

Core Java

a. 1,2,3

b. Order cannot be determined

c. compilation error

d. 3,2,1

Ans.a. 1,2,3

Q848. What will be the output upon executing main method ?

public static void main(String[] args){
      Set set = new HashSet();
      set.add(1);
      set.add(2);
      set.add(3);
      System.out.println(set);
   }

Core Java

a. 1,2,3

b. Order cannot be determined

c. Compilation error

d. 3,2,1

Ans.b. Order cannot be determined

Q849. What is Dirty Read in Database Transactions ?

Database

a. Data Read by Transaction 2 which hasn't yet updated by Transaction 1

b. Data Read by Transaction 2 which has been updated and commited by Transaction 1

c. Data Read by Transaction 2 which has been updated but not commited by Transaction 1

d. Inability of Transaction 2 to read Data when Transaction 1 is updating.

Ans.c. Data Read by Transaction 2 which has been updated but not commited by Transaction 1

Q850. Which of following annotation is used to initialize objects before executing set of tests ? Reference

Junit

a. @Test

b. @Ignore

c. @After

d. @Before

Ans.d. @Before

Q851. Optional has been introduced in Java 8 to get away with which of following exception ? Reference

Core Java

a. ArithmeticException

b. ParseException

c. NullPointerException

d. FileNotFoundException

Ans.c. NullPointerException

Q852. Which of the following methods are used by Java Garbage Collection Mechanism ?

Core Java

a. final

b. finally

c. finalize

d. All of the above

Ans.c. finalize

Q853. Which of the following about Garbage collection is false ?

Core Java

a. We can call Garbage collection explicitly

b. Garbage Collection guarantees that the application will not run out of memory

c. finalize method is used by Java for Garbage Collection

d. Garbage Collection Mechanism delete unclaimed objects that are no longer required

Ans.b. Garbage Collection guarantees that the application will not run out of memory

Q854. What is Lazy Initialization in Hibernate ? Reference

Hibernate

a. Feature to load the dependencies from Cache

b. Feature to load all objects and relationships in advance before they can be used

c. Feature to not load dependencies and relationship in advance and load when required

d. Feature to not load the dependencies and relationships at all

Ans.c. Feature to not load dependencies and relationship in advance and load when required

Q855. Which of the following is not the benefit of Lazy Initialization in Hibernate ?

Hibernate

a. Laod When required provides better performance

b. Object stays lighter

c. Less number of Database calls

d. Less load on Database

Ans.c. Less number of Database calls

Q856. What is the relationship between Vehicle and Engine in this example ?

public class Vehicle {
   Enginer engine;
   public void move(){
      engine = new Engine();
      engine.start();
   }
}

Core Java

a. Composition ( Vehicle has a Engine )

b. Composition ( Engine has a Vehicle )

c. Inheritance ( Vehicle is a Engine )

d. Inheritance ( Engine is a Vehicle )

Ans.a. Composition ( Vehicle has a Engine )

Q857. What is the relationship between Car and Vehicle in the following code ?

public class Car extends Vehicle{
   Engine engine;

   public static void main(String[] args){
      Vehicle vehicle = new Car();
      car.move();
   }

   public void move(){
      engine = new Engine();
      engine.start();
   }
}

Core Java

a. Composition ( Vehicle has a Car )

b. Composition ( Car has a Vehicle )

c. Inheritance ( Vehicle is a Car )

d. Inheritance ( Car is a Vehicle )

Ans.d. Inheritance ( Car is a Vehicle )

Q858. What is the problem with the following code ?

public class Car extends Vehicle{
   Vehicle vehicle;

   Car(){
      super();
      this.vehicle = new Vehicle();
   }
}

Core Java

a. There is an Inheritance as well as Composition relationship between Vehicle and Car which is not permitted

b. We cannot initialize the parent class instance within the constructor

c. Call to super is illegal

d. There is no problem

Ans.d. There is no problem

Q859. Which of the following collections stores its elements in natural sorting order ?

Core Java

a. HashMap

b. LinkedHashMap

c. TreeMap

d. EnumMap

Ans.c. TreeMap

Q860. Which of following stores its elements in natural Sorting Order ?

Core Java

a. AbstractSet

b. HashSet

c. LinkedHashSet

d. TreeSet

Ans.d. TreeSet

Q861. What kind of thread is Garbage collection thread ?

Core Java

a. Daemon Thread

b. User Thread

c. System Thread

d. Active Thread

Ans.a. Daemon Thread

Q862. Which of following are serialized ?

Core Java

a. static variables

b. transient variables

c. instance variables

d. method local variables

Ans.c. instance variables

Q863. What will be the output of this code

ArrayList list = new LinkedList();
list.add(3);
list.add(2);
list.add(1);
System.out.println(list);

Core Java

a. 1,2,3

b. 3,2,1

c. Order cannot be determined

d. Compilation Error

Ans.d. Compilation Error

Q864. Which of following memory segment is cleaned by Garbage Collection Mechanism ?

Core Java

a. Stack

b. Heap

c. Code

d. Cache

Ans.b. Heap

Q865. In Case a method is declared to throw an exception , We can only use a call to that method if ...

Core Java

a. We use the call within try block and catch the exception

b. We declare that the method is expected to throw the exception using throws

c. Both 1 and 2

d. Either 1 or 2

Ans.d. Either 1 or 2

Q866. Which of the following is not an Hibernate Annotation

Hibernate

a. @Id

b. @JoinTable

c. @ManyToMany

d. @Autowired

Ans.d. @Autowired

Q867. Which of following is not Spring MVC annotation ?

Spring

a. @Autowired

b. @Controller

c. @JoinColumn

d. @Transactional

Ans.c. @JoinColumn

Q868. Which of the following is true ?

Core Java

a. throw and throws are used to throw an exception

b. throw is used to throw an exception whereas throws is a declaration that the method can throw the exception

c. throws is used to throw an exception whereas throw is a declaration that the method can throw the exception

d. throw and throws are used to declare that an exception can be thrown by the method

Ans.b. throw is used to throw an exception whereas throws is a declaration that the method can throw the exception

Q869. throws is a declaration that the ..... is expected to throw an exception ?

Core Java

a. Variable

b. Method

c. Class

d. Interface

Ans.b. Method

Q870. Which of the following collection classes store their elements as Key Value pairs ?

Core Java

a. Set

b. List

c. Map

d. Queue

Ans.c. Map

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