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Q01-Q07 written test questions and answers on core Java

Written tests can help short-list candidates and often used by recruitment agencies and prospective employers. Here are some popular written test questions and answers. Note: Multiple choice questions may have more than one right answers. Q1. What will be the output of the following code snippet? … Read more ›...

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Q01-Q28: Top 50+ FAQ JEE interview Q&As

Java interview questions & answers on EE (i.e. Enterprise Edition) with lots of diagrams & code to quickly grasp the concepts for the beginner to advanced Java developers. It pays to brush-up before attending Java job interviews. Q1. Can you describe the high level architecture of the application that you...

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Q08 – Q15 Hibernate interview Q&As

Extends 15+ Hibernate interview questions & answers – Q1 – Q7. Hibernate interview questions & answers with diagrams & code snippets to not only prepare for the job interviews, but also to easily grasp the concepts Q9. Explain hibernate object states? Explain hibernate objects life cycle? … Read more ›...

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Q08-Q15 written test questions and answers on core Java

Q8. What will be the statement you add so that you invoke Abc’s process( ) method?

package com.writtentest5;

public class Abc {

 public void process(){
    System.out.println("Processing Abc");
 }

}

package com.writtentest5;

public class Abc {

public void process(){

System.out.println("Processing Abc");

}

package com.writtentest5;

public class Def extends Abc {
 
 public void process(){
    System.out.println("Processing Def");
    ___________________________________ //how will you invoke Abc's process method here?
 }
 

 public static void main(String[] args) {
    Abc myApp = new Def();
    myApp.process();
 }

}

package com.writtentest5;

public class Def extends Abc {

public void process(){

System.out.println("Processing Def");

___________________________________ //how will you invoke Abc's process method here?

}

public static void main(String[] args) {

Abc myApp = new Def();

myApp.process();

}

A8. super.process( ) will invoke parent class’s process( ) method. … Read more ›...

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Q1 – Q10 Java OOPs interview Q&As

If you don’t get Java OOPs interview questions & answers right in the job interviews you can say OOPS !!!! to your Java interview success. Q1. Is Java a 100% Object Oriented (OO) language? if yes why? and if no, why not? A1. … Read more ›...

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Q16-Q24 written test questions and answers on core Java

Q16. If there is a source array list with 15MB of data, and the you create a new target empty array list and copy the source to target with target.addAll(source). How much memory will be consumed after invoking the addAll(…) method? A16. … Read more ›...

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Q29-Q53: Top 50+ FAQ JEE Interview Q&As

This extends Q1 – Q28 EE Java interview Questions and Answers Q29. What are the different ways can you wire up your dependencies using Spring? A29. 3 different ways. You can combine all 3 ways. Using an XML based application context file as demonstrated here in STEP 4 . …...

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QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability – Non Functional Requirements

Q1. What are the system qualities that typically form a basis for QoS requirements? A1. Quality of service (QoS) covers Non Functional requirements such as As microservices use disparate datasources like SQL store, NoSQL store, Cache, Object store like AWS S3, … Read more ›...

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Queue from scratch Java example

Q. If Java did not have a Queue implementation, how would you go about implementing your own? A. A queue can be implemented in a similar fashion to a stack by declaring a backingArray, a frontIndex, a backIndex, and a currentSize. Initialize the frontIndex to 0 and the backIndex to...

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Quick Sort in Java

Q. Is there a more efficient sorting algorithm than bubble sorting? A. Although bubble-sort is one of the simplest sorting algorithms, it’s also one of the slowest. It has the O(n2) time complexity. Faster algorithms include quick-sort and heap-sort. The Arrays.sort( ) method uses the quick-sort algorithm, … Read more...

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Recursion Vs Tail Recursion

Q1. Can you write a sample code that will count the number of “A”s in a given text? Show iterative, recursive, and tail recursive approaches?

“AAA rating”

A1.

Iteration

public class Iteration {

    public int countA(String input) {
        if (input == null || input.length( ) == 0) {
            return 0;
        }

        int count = 0;
        for (int i = 0; i < input.length( ); i++) {
            if(input.substring(i, i+1).equals("A")){
                count++;
            }
        }
        return count;
    }

    public static void main(String[ ] args) {
          System.out.println(new Iteration( ).countA("AAA rating"));     // Ans.3
    }
}

public class Iteration {

public int countA(String input) {

if (input == null || input.length( ) == 0) {

return 0;

}

int count = 0;

for (int i = 0; i < input.length( ); i++) {

if(input.substring(i, i+1).equals("A")){

count++;

}

return count;

}

public static void main(String[ ] args) {

System.out.println(new Iteration( ).countA("AAA rating")); // Ans.3

}

Recursion

public class RecursiveCall {

    public int countA(String input) {
       
        // exit condition – recursive calls must have an exit condition
        if (input == null || input.length( ) == 0) {
            return 0;
        }

        int count = 0;
         
        //check first character of the input 
        if (input.substring(0, 1).equals("A")) {
            count = 1;
        }
        
        //recursive call to evaluate rest of the input 
        //(i.e.  2nd character onwards)
        return count + countA(input.substring(1)); 
    }

    public static void main(String[ ] args) {
        System.out.println(new RecursiveCall( ).countA("AAA rating"));    // Ans. 3
    }
}

public class RecursiveCall {

public int countA(String input) {

// exit condition – recursive calls must have an exit condition

if (input == null || input.length( ) == 0) {

return 0;

}

int count = 0;

//check first character of the input

if (input.substring(0, 1).equals("A")) {

count = 1;

}

//recursive call to evaluate rest of the input

//(i.e. 2nd character onwards)

return count + countA(input.substring(1));

}

public static void main(String[ ] args) {

System.out.println(new RecursiveCall( ).countA("AAA rating")); // Ans. 3

}

Many find it harder to understand recursion,

…

Regular Expressions interview Q&As for Java developers

Q1 What’s the difference between a wildcard and a regular expression? A1 A wildcard is a generic term referring to something that can be substituted for all possibilities. In computer terms, usually a simple “wildcard” is just a * that can match one or more characters, … Read more ›...

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Reverse a given String

Q1. Can you write a method that reverses a given String? A1. Can be done a number of different ways. Best Practice: Using the Proven Java API

public class ReverseString {

    public static void main(String[ ] args) {
        System.out.println(reverse("big brown fox"));
        System.out.println(reverse(""));       
    }

    public static String reverse(String input) {
        if(input == null || input.length( ) == 0){
            return input;
        }
		
        return new StringBuilder(input).reverse( ).toString( ); 
    }
}

public class ReverseString {

public static void main(String[ ] args) {

System.out.println(reverse("big brown fox"));

System.out.println(reverse(""));

}

public static String reverse(String input) {

if(input == null || input.length( ) == 0){

return input;

}

return new StringBuilder(input).reverse( ).toString( );

}

It is always a best practice to reuse the API methods as shown above with the StringBuilder(input).reverse( ) method as it is...

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Blog Archives

Q01-Q07 written test questions and answers on core Java

Q01-Q28: Top 50+ FAQ JEE interview Q&As

Q08 – Q15 Hibernate interview Q&As

Q08-Q15 written test questions and answers on core Java

Q1 – Q10 Java OOPs interview Q&As

Q16-Q24 written test questions and answers on core Java

Q29-Q53: Top 50+ FAQ JEE Interview Q&As

QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability – Non Functional Requirements

Queue from scratch Java example

Quick Sort in Java

Recursion Vs Tail Recursion

Regular Expressions interview Q&As for Java developers

Reverse a given String

300+ Java Interview FAQs

300 + Big Data Interview FAQs

16+ Java Tech Key Areas

10+ Companion Techs Q&As

300+ Java Interview Q&As

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