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Recently asked in Sophos

Q1111. Write a Method to get a map of words and their count by passing in the string

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+get+a+map+of+words&category=code

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_{Like Discuss Correct / Improve map collections Asked in 2 Companies intermediate}

Q1112. Write code for singleton class

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=singleton+class&category=code

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_{Like Discuss Correct / Improve singleton code coding design pattern Asked in 1 Companies Intermediate frequent}

Q1113. What will happen if we don't have termination statement in recursion ?

Ans. Function call allocates a stackframe in stack. Every stackframe will use some memory to store local variables, parameters and to remember return address. Without terminating condition stackframes will keep consuming memory from stack and eventually program will result in stackoverflow error.

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_{Like Discuss Correct / Improve recursion break statement break stackoverflow exception stackoverflow memory management memory exceptions}

Q1114. How is static and dynamic polymorphism achieved in Java ?

Ans. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

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_{Like Discuss Correct / Improve static polymorphism object oriented programming (oops) oops concepts dynamic polymorphism object oriented programming (oops) oops concepts polymorphism object oriented programming (oops) oops concepts overloading overriding broadridg Asked in 1 Companies basic frequent}

Very frequently asked to fresh graduates. Frequently asked in NSEiT and Accenture India

Q1115. Write a program to Generate prime numbers till a given number

Ans. public class Main {
public static void main(String args[]) {
int number = 2;
int count = 0;
long sum = 0;
int givenNumber = 1000;
while (count < givenNumber) {
if (isPrimeNumber(number)) {
sum = number;
count;
}
number;
}
System.out.println(sum);
}
private static boolean isPrimeNumber(int number) {
for (int i = 2; i <= number / 2; i) {
if (number % i == 0) {
return false;
}
}
return true;
}
}

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_{Like Discuss Correct / Improve generate prime numbers code coding Asked in 5 Companies basic frequent}

Q1116. Write a program to calculate factorial of a number using recursion

Ans.

public class Factorial {
   public static void main(String[] args){
      int x = 5;

      System.out.println(calculateFactorial(x));

   }

   private static int calculateFactorial(int x){
      if(x==1){
         return 1;
      }
      return x * calculateFactorial(x-1);
   }
}

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_{Like Discuss Correct / Improve factorial calculate factorial code coding recursion Asked in 1 Companies basic}

Q1117. Write code for the usage of Builder Design Pattern

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=964

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_{Like Discuss Correct / Improve builder design pattern builder pattern code coding intermediate}

Q1118. Write code to check if an integer is odd or even using ternary operator

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=963

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_{Like Discuss Correct / Improve ternary operator code coding}

Recently asked in Capital One.

Q1119. What will happen if we call perform(null) ?

public void perform(Object obj) {
System.out.println("Object");
}

public void perform(Integer int) {
System.out.println("Integer");
}

Ans. compiler will throws error as ambiguous methods

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_{Like Discuss Correct / Improve overloading method overloading Asked in 1 Companies intermediate}

Q1120. In which cases , moving methods to utility class could be useful ?

Ans. It could be worthy to move a method to util class if the method needs to be shared, doesn't require polymorphic behavior and need not be overridden in special cases.

Don't belong to one group through is-a relationship ( You can share through parent class method )

Don't implement a specific interface ( java 8 default methods )

Doesn't involve complex computing as you will be loosing the benefit of object state with just static method.

Doesn't require polymorphic behavior as static methods don't participate in runtime polymorphism.

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_{Like Discuss Correct / Improve utility classes util classes static methods application design rare}

Q1121. Write a program for Coin Changer application ?

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=979

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_{Like Discuss Correct / Improve coin changer application coin changing general electic (ge)}

Q1122. What is a Destructor ? Do we have Destructors in Java ?

Ans. Destructor is used to de-allocate memory allocated by objects.

There are no destructors in Java. Alternatively, Java provides Automatic garbage collection i.e automatically releasing the un-referenced memory.

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_{Like Discuss Correct / Improve destructor garbage collection Asked in 11 Companies Basic frequent}

Try 1 Question(s) Test

Q1123. What is use of Revert in SVN?

Ans. Revert your local changes.

There are 2 types of reverts -

1) Local Revert: It will delete all changes from files which you made after updates and before commit.
2) Repo Revert: Upload the changes to previous Repo.

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_{Like Discuss Correct / Improve svn subversion version control system configuration management Asked in 2 Companies}

Q1124. Can we have multiple threads consuming message stream from a single partition ?

Ans. Yes, by having multiple Consumer Groups.

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_{Like Discuss Correct / Improve apache kafka kafka kafka consumer kafka topic partitions bigdata consumer group}

Q1125. Can we have multiple threads consuming messages from a single partition if we have single Consumer Group ?

Ans. No, we can only have max 1 thread per partition in a single Consumer Group.

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_{Like Discuss Correct / Improve apache kafka kafka kafka consumer kafka topic partitions bigdata consumer group}

Q1126. If we have more threads than partitions in a kafka consumer, How can we model it efficiently ?

Ans. We will have to use multiple consumer groups in that case as threads will remain idle if we use single consumer group. A more sophisticated algorithm could be required with multiple groups if we have to ensure the order of consumption.

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_{Like Discuss Correct / Improve apache kafka kafka kafka consumer kafka topic partitions bigdata consumer group}

Q1127. 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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_{Like Discuss Correct / Improve oops object oriented programming object oriented language primitive data types Asked in 2 Companies}

Q1128. 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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_{Like Discuss Correct / Improve collections iterator}

Q1129. 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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_{Like Discuss Correct / Improve synchronization class level lock object level lock}

Q1130. 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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_{Like Discuss Correct / Improve multithreading threads yielding sleeping thread states}

Q1131. What is a compilation unit in Java ?

Ans. Java Source Code File

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_{Like Discuss Correct / Improve compilation unit in java}

Q1132. 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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_{Like Discuss Correct / Improve associativity expression evaluation operator}

Q1133. How can we create objects if we make the constructor private ?

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

Q1134. 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

Q1135. 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

Q1136. 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");

Q1137. 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

Q1138. 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

Q1139. 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)

Q1140. Which of the following http response means the resource is not found ?

a. 500

b. 200

c. 404

d. 400

Ans.c. 404

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