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QUEST GLOBAL IS HIRING : JUNIOR JAVA DEVELOPER

QUEST GLOBAL is hiring Freshers for the JUNIOR JAVA DEVELOPER. The details of the job, requirements and other information given below:

QUEST GLOBAL IS HIRING : JUNIOR JAVA DEVELOPER

Don’t miss out, CLICK HERE (to apply before the link expires)

Junior Java Developer – Interview Questions and Answers

1. What is Java and why do we use it?

Answer:
Java is a programming language that is used to build software applications. It is popular because it is simple to learn, works on all platforms (Windows, Linux, Mac), and is very secure. Java is used in many areas like mobile apps, web applications, and enterprise software. One big benefit is that you can write code once and run it anywhere (this is called “Write Once, Run Anywhere”).

2. What are the main features of Java?

Answer:
Some important features of Java are:

3. What is the difference between JDK, JRE, and JVM?

Answer:

4. What are classes and objects in Java?

Answer:
A class is like a blueprint. It defines how something should behave. For example, a class Car can have properties like color, speed, and methods like start() or stop().

An object is a real-world thing created from a class. If the class is Car, then an object could be myCar, which is red and can go at 100km/h.

5. What is inheritance in Java?

Answer:
Inheritance means one class can use the features of another class. For example, if we have a class Animal, we can create a class Dog that inherits from Animal. The Dog class can use the methods and variables of Animal, and also have its own.

6. Explain the concept of constructors.

Answer:
A constructor is a special method that is called when an object is created. It has the same name as the class. It is used to initialize values.

Example:

java
public class Car {
Car() {
System.out.println("Car is created");
}
}

When we create Car myCar = new Car();, the constructor will run and print the message.

7. What is the difference between “==” and “.equals()”?

Answer:

Example:

java
String a = new String("Hello");
String b = new String("Hello");

System.out.println(a == b); // false (different memory)
System.out.println(a.equals(b)); // true (same value)

8. What is the purpose of the “final” keyword in Java?

Answer:
The final keyword is used to prevent changes.

9. What is the Spring Framework?

Answer:
Spring is a popular Java framework used to build web and enterprise applications. It helps manage the components of a large application easily. It has features like dependency injection, which helps reduce the complexity of code.

10. What is the difference between ArrayList and LinkedList?

Answer:

11. What is exception handling in Java?

Answer:
Exception handling is used to manage errors in a program without stopping it. Java uses try-catch blocks to handle exceptions. This way, we can fix issues like dividing by zero, or file not found, without crashing the app.

Example:

java
try {
int result = 10 / 0;
} catch (ArithmeticException e) {
System.out.println("Cannot divide by zero");
}

12. What tools do you use for Java development?

Answer:
Some common tools are:

13. Have you worked with databases in Java?

Answer:
Yes, in Java we use JDBC (Java Database Connectivity) to connect to databases. We can write SQL queries in Java to insert, update, delete, or fetch data from the database. Some frameworks like Spring also help in connecting to databases more easily.

14. What is the use of ‘this’ keyword in Java?

Answer:
The this keyword refers to the current object. It is used when local variables and class variables have the same name.

Example:

java
public class Student {
int age;

Student(int age) {
this.age = age;
}
}

15. Why should we hire you for this Java Developer role?

Answer:
I am a passionate learner who understands Java and its core principles well. I can write clean and readable code, and I enjoy solving problems using logic. I am familiar with frameworks like Spring and can also work with front-end technologies. I am a good team player and always try to complete tasks on time.

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