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Json - Interview Questions and Answers for 'L' - 8 question(s) found - Order By Newest

 Q1. What are the benefits of JSON over XML ?Json
Ans. Lighter and faster than XML as on-the-wire data format

Object Representation - Information is presented in object notations and hence better understandable.

Easy to parse and conversion to objects for information consumption.

Support multiple data types - JSON supports string, number, array, boolean whereas XML data are all string.

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  Q2. What is JSON ?Json
Ans. JSON is "JavaScript Object Notation", primarily used for client-server or server-server communication. Its a much lighter and readable alternative to XML. JSON is language independent and is easily parse-able in all programming languages.

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 Q3. Which function is used to convert a JSON text into an object ?Json
Ans. eval

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 Q4. Which data types are supported by JSON ?Json
Ans. Number
String
Boolean
Array
Object
null

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 Q5. Which markup languages can be used in restful web services ? Rest
Ans. XML and JSON ( Javascript Object Notation ).

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 Q6. Can you explain JSON specification ?JSON
 This question was recently asked at 'One Click Retail'.This question is still unanswered. Can you please provide an answer.


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 Q7. Can comments be added in JSON ?JSON
Ans. No, It should all be data.

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 Q8. Why would you use XML over JSON when using ajax ?JSON
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 Q9. What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);
Core Java
a. falsetruetrue
b. truetruetrue
c. truetruefalse
d. falsetruefalse

Ans.a. falsetruetrue
 Q10. What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);
Core Java
a. falsetruetrue
b. falsefalsetrue
c. truetruetrue
d. falsefalsefalse

Ans.c. truetruetrue
 Q11. Which method needs to be implemented if a class is implementing comparable interface ?Core Java
a. comp
b. compare
c. compareTo
d. compareEquals

Ans.c. compareTo
 Q12. Which of the following is false ?Core Java
a. A Class cannot override both hashcode and equals method.
b. A class can override both hashcode and equals method.
c. A Class must override hashCode method if its overridding equal method.
d. A Class can override hashCode even if its not overridding equals method.

Ans.a. A Class cannot override both hashcode and equals method.
 Q13. Collections is a / an ..Core Java
a. interface
b. abstract class
c. final class
d. util class

Ans.d. util class
 Q14. 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
 Q15. 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
 Q16. With the following code, Which is a valid way to initialize ?
public class BuggyBread {

   private String element1;

   private String element2;

   private BuggyBread(String element1, String element2){
      this.element1 = element1;
      this.element2 = element2;
   }

   public static class Builder {
   
      private String element1;

      private String element2;

      Builder(BuggyBread buggybread){
         element1 = buggybread.element1;
         element2 = buggybread.element2;
      }

      Builder withElement1(String element1){
         this.element1 = element1;
         return this;
      }

      Builder withElement2(String element2){
         this.element2 = element2;
         return this;
      }

      BuggyBread build(){
         BuggyBread buggybread = new BuggyBread(element1,element2);
         return buggybread;
      }
   }
}		Core Java
a. BuggyBread buggybread = new BuggyBread();
b. BuggyBread buggybread = new BuggyBread("element1","element2");
c. BuggyBread.Builder builder = new BuggyBread.Builder();
d. BuggyBread.Builder builder = new BuggyBread.Builder("element1","element2");

Ans.d. BuggyBread.Builder builder = new BuggyBread.Builder("element1","element2");
 Q17. What will be the output of following code ?

public class BuggyBread {
   
   private int x;
   private int y;
   
   BuggyBread(int x,int y){};
   
   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread();
      System.out.println(buggybread.x);
   }
}		Core Java
a. 0
b. null
c. compilation error due to uninitialized element
d. compilation error due to constructor

Ans.d. compilation error due to constructor
 Q18. What will be the output of following ?

public class BuggyBread {

   private int x;
   private Integer y;

   BuggyBread(int x,int y){};

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(1,2);
      System.out.println(buggybread.x);
      System.out.println(buggybread.y);
   }
}		Core Java
a. 0 0
b. 0 null
c. null 0
d. null null

Ans.b. 0 null
 Q19. 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
 Q20. 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
 Q21. Which of the following is true for == operator ?Core Java
a. For primitives, == checks if the variables on left and right have same data type
b. For primitives, == checks if the variables on left and right have same value
c. For Objects, == checks if the references on left and right have same data type
d. For Objects, == checks if the references on left and right have same value

Ans.b. For primitives, == checks if the variables on left and right have same value
 Q22. Which of the following is equivalent to following logic ?

Not X && Not Y		Core Java
a. x || Y
b. Not(X || Y)
c. Not(X && Y)
d. Not X && Y

Ans.b. Not(X || Y)
 Q23. Optional has been introduced in Java 8 to get away with which of following exception ?Core Java
a. ArithmeticException
b. ParseException
c. NullPointerException
d. FileNotFoundException

Ans.c. NullPointerException
 Q24. Which of the following is not true for abstract classes ?Core Java
a. Abstract Class is only meant to be sub classed and not supposed to be instantiated.
b. Abstract class handlers can be used to handle derived class objects.
c. We can't have an abstract class without abstract methods.
d. Abstract class has member elements.

Ans.c. We can't have an abstract class without abstract methods.
 Q25. Which of the following class creates immutable objects ?Core Java
a. String
b. StringBuffer
c. StringBuilder
d. None of these create immutable objects.

Ans.a. String
 Q26. Which of the following class is synchronized ?Core Java
a. String
b. StringBuffer
c. StringBuilder
d. None of these

Ans.b. StringBuffer
 Q27. 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
 Q28. 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
 Q29. What is Lazy Initialization in Hibernate ?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
 Q30. 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

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