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Interview Questions and Answers - Order By Rating

Q2071. Why Java is not considered pure OOP's language ?

Ans. There are 2 reasons for it.

1. Usage of Primitive types - Though Java provides classes for the primitive data types but as the usage of primitives is permissible, its considered unpure OOP's language.

2. Usage of Static members - Static members belong to the class and not objects and hence not considered fit for pure OOP's programming.

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Q2072. Is Iterator a class ?

Ans. No, iterator is an interface that is used to parse through the elements of a Collection

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Q2073. 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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Q2074. Difference between Yielding and Sleeping ?

Ans. When a task invokes its yield method, it returns to the ready state. When a task invokes its sleep method, it returns to the waiting state.

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Q2075. What is the use of Runtime Class ?

Ans. This class is used to provide access to the Java runtime system

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Q2076. What should a class do if its extending an abstract class ?

Ans. It should either implement the abstract methods or re-declare them abstract.

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Q2077. What is a compilation unit in Java ?

Ans. Java Source Code File

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Q2078. What is Associativity while evaluating a Java statement ?

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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Q2079. 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);

a. falsetruetrue

b. truetruetrue

c. truetruefalse

d. falsetruefalse

Ans.a. falsetruetrue

Q2080. 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);

a. falsetruetrue

b. falsefalsetrue

c. truetruetrue

d. falsefalsefalse

Ans.c. truetruetrue

Q2081. Which method needs to be implemented if a class is implementing comparable interface ?

a. comp

b. compare

c. compareTo

d. compareEquals

Ans.c. compareTo

Q2082. Which of the following is false ?

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.

Q2083. Collections is a / an ..

a. interface

b. abstract class

c. final class

d. util class

Ans.d. util class

Q2084. 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");
}
}

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

Q2085. 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();
}
}

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

Q2086. 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;
      }
   }
}

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");

Q2087. 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);
   }
}    Reference

a. 0

b. null

c. compilation error due to uninitialized element

d. compilation error due to constructor

Ans.d. compilation error due to constructor

Q2088. 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);
   }
}    Reference

a. 0 0

b. 0 null

c. null 0

d. null null

Ans.b. 0 null

Q2089. 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);
   }

a. 1,2,3

b. Order cannot be determined

c. compilation error

d. 3,2,1

Ans.a. 1,2,3

Q2090. 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);
   }

a. 1,2,3

b. Order cannot be determined

c. Compilation error

d. 3,2,1

Ans.b. Order cannot be determined

Q2091. Which of the following is true for == operator ?

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

Q2092. Which of the following is equivalent to following logic ?

Not X && Not Y

a. x || Y

b. Not(X || Y)

c. Not(X && Y)

d. Not X && Y

Ans.b. Not(X || Y)

Q2093. Optional has been introduced in Java 8 to get away with which of following exception ? Reference

a. ArithmeticException

b. ParseException

c. NullPointerException

d. FileNotFoundException

Ans.c. NullPointerException

Q2094. Which of the following is not true for abstract classes ? Reference

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.

Q2095. Which of the following class creates immutable objects ? Reference

a. String

b. StringBuffer

c. StringBuilder

d. None of these create immutable objects.

Ans.a. String

Q2096. Which of the following class is synchronized ? Reference

a. String

b. StringBuffer

c. StringBuilder

d. None of these

Ans.b. StringBuffer

Q2097. Which of the following methods are used by Java Garbage Collection Mechanism ?

a. final

b. finally

c. finalize

d. All of the above

Ans.c. finalize

Q2098. Which of the following about Garbage collection is false ?

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

Q2099. What is Lazy Initialization in Hibernate ? Reference

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

Q2100. Which of the following is not the benefit of Lazy Initialization in 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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