Quick Prep Java Interview Archives | Page 8 of 28

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03: Spring MVC with Java Configs instead of XML configs step by step

This tutorial extends Spring MVC form submission tutorial step by step. This tutorial gets rid of web.xml and applicationContext.xml files.

pom.xml changes

Step 1: Add “JSTL” (i.e. JSP Standard Tag Library ) jar dependency,

…

03: Tree navigation – is a BST Tree?

Q. Complete the method “isValidBST(Node root)” which takes a “Tree node” as an input to evaluate if the input is a valid BST (i.e. Binary Search Tree)?



public class BinarySearchTree {
 
    public static boolean isValidBST(Node root) {
        throw new RuntimeException("To be completed");
    }

    public static void main(String[] args) { 
        Node n4 = new Node(2, null, null);
        Node n5 = new Node(4, null, null); 
        Node n6 = new Node(6, null, null);
        Node n7 = new Node(8, null, null);
        
        Node n1 = new Node(3, n4, n5);
        Node n3 = new Node(7, n6, n7);
        
        //root node
        Node n2 = new Node(5, n1, n3);
 
        System.out.println(isValidBST(n2));
    }
}

class Node {
    public int value;
    public Node left, right;
 
    public Node(int value, Node left, Node right) {
        this.value = value;
        this.left = left;
        this.right = right;
    }
}

public class BinarySearchTree {

public static boolean isValidBST(Node root) {

throw new RuntimeException("To be completed");

}

public static void main(String[] args) {

Node n4 = new Node(2, null, null);

Node n5 = new Node(4, null, null);

Node n6 = new Node(6, null, null);

Node n7 = new Node(8, null, null);

Node n1 = new Node(3, n4, n5);

Node n3 = new Node(7, n6, n7);

//root node

Node n2 = new Node(5, n1, n3);

System.out.println(isValidBST(n2));

}

class Node {

public int value;

public Node left, right;

public Node(int value, Node left, Node right) {

this.value = value;

this.left = left;

this.right = right;

}

A. Detailed answers on recursive & … Read more ›...

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03: Tree traversal algorithms in Java

Q1. What are the different binary tree traversal mechanisms? A1. Traversing a tree means visiting all the nodes of a tree in order. Many different binary tree algorithms involve traversals. For example, if you wish to count the number of employees in an organizational chart you must visit each node....

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03: Understanding Big O notations with Java

Q1. Have you seen job advertisements requiring Java candidates to work in real-time or high volume transaction processing systems? A1. If you are applying for such jobs, you can be quizzed on Big O notation. Here are some basics to brush up on. … Read more ›...

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03: Understanding Git terms origin, master, and head

Q1. What is a .git folder? A1. Like .SVN folder for subversion holding the metat data, .git folder holds the Git meta data like remote repository, branch names, etc. If you do

cat head

cat head

it shows that you are on the branch “ … Read more ›...

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03: What is wrong with this code? Data types & equals( ) Vs, hashCode( ) contract

Q6. What is wring with this code?

public class WhatIsWrong {

    public static void main(String args[]) {

        float sum = 0;
        while (sum != 1.0) { 
            sum += 0.1;
        }
        System.out.print("The sum is: "+sum);

    }
}

public class WhatIsWrong {

public static void main(String args[]) {

float sum = 0;

while (sum != 1.0) {

sum += 0.1;

}

System.out.print("The sum is: "+sum);

}

A6. Infinite loop at due to sum != 1.0. Using floating point variables like float or double in loops to compare for equality can lead to infinite loops. Comparing for “” or “

…

04 17 Spring bean life cycles & scopes FAQs

Q1. Does Spring dependency injection happen during compile time or runtime? A1. Runtime during creating an object. Q2. What is the difference between prototype scope and singleton scope? Which one is the default? A2.Singleton means single bean instance per IoC container, … Read more ›...

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04: Identifying and fixing LazyInitializationException in Hibernate

LazyInitializationException is thrown when an object becomes detached, and if you try to access associated (i.e. proxied) object(s) of a detached object.

Q. What is a detached object in Hibernate?

When you close an individual Hibernate Session, the persistent objects you are working with are detached.

…

04: 7 Java Collection Quizzes

Q1. When is an object needs to implement the Comparable interface? a) When adding it to a HashSet. b) When adding it to a TreeSet. c) When adding it to a LinkedHashSet. … Read more ›...

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04: 7 JSP interview questions and answers

JSF or JavaScript based frameworks like angularjs, ember, etc are more popular than JSPs for web developemnt. Q1. What is a JSP? How does it differ from a Servlet? A1. JSP stands for Java Server Pages. JSP technology extends the Servlet technology, which means anything you can do with a...

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04: Are Anagrams – Complete the given code

Q. Complete the “areAnagrams(String a, String b)” method so that it returns if two given input strings are anagram or not?


public class InputAreAnagrams {
    public static boolean areAnagrams(String a, String b) {
       throw new RuntimeException("Not yet implemented....");
    }

    public static void main(String[] args) {
        System.out.println(areAnagrams("leading", "aligned"));
    }
}

public class InputAreAnagrams {

public static boolean areAnagrams(String a, String b) {

throw new RuntimeException("Not yet implemented....");

}

public static void main(String[] args) {

System.out.println(areAnagrams("leading", "aligned"));

}

A. An anagram is a word formed from another by rearranging its letters. For example, … Read more ›...

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04: As a Java developer, can you think of a time where you ……?

It really pays to jog your memory prior to job interviews to ace the open-ended questions like……As a Java developer, can you think of a time where you…….? Q1. Can you think of a time where you accomplished QuickWins for your company? A1. … Read more ›...

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04: Azure interview Q&As on compute

Q01. What are the Compute options Azure provide? A01 Azure compute services can be IaaS, PaaS and Serverless. Azure provides: 1) Azure Virtual Machines (i.e. VMs) are IaaS allowing you to deploy and manage VMs inside a virtual network (VNet). … Read more ›...

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Categories

Blog Archives

03: Spring MVC with Java Configs instead of XML configs step by step

03: Tree navigation – is a BST Tree?

03: Tree traversal algorithms in Java

03: Understanding Big O notations with Java

03: Understanding Git terms origin, master, and head

03: What is wrong with this code? Data types & equals( ) Vs, hashCode( ) contract

04 17 Spring bean life cycles & scopes FAQs

04: Identifying and fixing LazyInitializationException in Hibernate

04: 7 Java Collection Quizzes

04: 7 JSP interview questions and answers

04: Are Anagrams – Complete the given code

04: As a Java developer, can you think of a time where you ……?

04: Azure interview Q&As on compute

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