Prepare for your Oracle Java developer interview with these top 10 questions. Get expert tips and insights to ace your interview and land your dream job.
Oracle Interview Experience:
Oracle Java Developer Interview overall there were 6 rounds in total, inclusive of the Screening Round. So, hereโs a Round wise division:
- ๐ ๐ผ๐๐ ๐๐ฟ๐ถ๐๐ถ๐ฐ๐ฎ๐น (๐ฆ๐ฐ๐ฟ๐ฒ๐ฒ๐ป๐ถ๐ป๐ด ๐ฅ๐ผ๐๐ป๐ฑ)
- ๐ง๐ฒ๐ฐ๐ต ๐ฅ๐ผ๐๐ป๐ฑ๐ (๐๐ผ๐ฑ๐ถ๐ป๐ด) ๐ฅ๐ผ๐๐ป๐ฑ ๐ญ & ๐ฎ
- ๐ง๐ฒ๐ฐ๐ต ๐ฅ๐ผ๐๐ป๐ฑ (๐ฆ๐๐๐๐ฒ๐บ ๐๐ฒ๐๐ถ๐ด๐ป) ๐ฅ๐ผ๐๐ป๐ฑ ๐ฏ
- ๐ง๐ฒ๐ฐ๐ต ๐ฅ๐ผ๐๐ป๐ฑ ๐ฅ๐ผ๐๐ป๐ฑ ๐ฐ
- ๐๐ถ๐ฟ๐ถ๐ป๐ด ๐ ๐ฎ๐ป๐ฎ๐ด๐ฒ๐ฟ ๐ฅ๐ผ๐๐ป๐ฑ ๐ฑ
๐ ๐ผ๐๐ ๐๐ฟ๐ถ๐๐ถ๐ฐ๐ฎ๐น (๐ฆ๐ฐ๐ฟ๐ฒ๐ฒ๐ป๐ถ๐ป๐ด ๐ฅ๐ผ๐๐ป๐ฑ) :
There was also an in-depth discussion on Java Theory and code snippets, involving the internal implementation of various classes and data structures
๐ง๐ฒ๐ฐ๐ตnical ๐ฅ๐ผ๐๐ป๐ฑ๐ (๐๐ผ๐ฑ๐ถ๐ป๐ด) ๐ฅ๐ผ๐๐ป๐ฑ ๐ญ & ๐ฎ :-
These rounds involved medium-level coding questions that emphasized logic-building and finding tricky edge cases.After I successfully done oracle java developer technical discussion We discussed my previous projects and technical contributions within them.
Technical Round (System Design): Round 3
Oracle java developer interview 3rd Round of completely on LLD questions and various HLD problems with discussions on edge cases, efficiency, and best practices.
Technical Round 4:
This Round Fully focus behavioral round and discussion My knowledge about the Company.
HR Manager Round 5:
In this round, the interviewer discussed deeply about my previous projects, and the role being offered. This is an informal round where the interviewer can ask general questions about the candidate’s work experience and ethics-related inquiries.
Oracle coding questions:
Oracle java developer interview questions most of related Programming and theoretical Related. Fibonacci Series, Reverse a String, Array Operation, Linked List Operations, Exception Handling. It’s essential to be familiar with SQL and Java fundamentals, data structures, and algorithms to perform well in Oracle coding interviews.
Recursion in Java is a programming technique where a method calls itself to solve a problem. Here’s an example of a recursive method to calculate the factorial of a non-negative integer:
public class FactorialExample {
public static void main(String[] args) {
int n = 5;
long factorial = calculateFactorial(n);
System.out.println("Factorial of " + n + " is: " + factorial);
}
public static long calculateFactorial(int n) {
if (n == 0 || oracle java interview questionsn == 1) {
return 1; // Base case: factorial of 0 and 1 is 1
} else {
return n * calculateFactorial(n - 1); // Recursive call to calculate factorial
}
}
}The calculateFactorial() method takes an integer n as input and returns the factorial of n.
- In the method, there’s a base case: if
nis 0 or 1, the method returns 1 because the factorial of 0 and 1 is 1. - Otherwise, the method recursively calls itself with
n - 1and multiplies the result byn. This process continues untilnbecomes 0 or 1, at which point the recursion stops.
When you run this program with n = 5, the output will be:
Factorial of 5 is: 120
Because 5! = 5 * 4 * 3 * 2 * 1 = 120
Recursion is a powerful technique, but it’s essential to ensure that recursive methods have proper termination conditions (base cases) to avoid infinite recursion. Additionally, excessive recursion can lead to stack overflow errors, so it’s essential to use recursion judiciously and consider alternatives like iteration when appropriate.
This Java program generates the Fibonacci series up to n terms, where n is specified by the user. It initializes the first two terms as 0 and 1, respectively, and then iteratively calculates the next term by adding the previous two terms. Finally, it prints each term of the Fibonacci series. You can adjust the value of n to generate the Fibonacci series with a different number of terms.
public class FibonacciSeries {
public static void main(String[] args) {
int n = 10; // Number of terms in the Fibonacci series
generateFibonacci(n);
}
public static void generateFibonacci(int n) {
int firstTerm = 0, secondTerm = 1;
System.out.println("Fibonacci Series up to " + n + " terms:");
for (int i = 1; i <= n; i++) {
System.out.print(firstTerm + " ");
int nextTerm = firstTerm + secondTerm;
firstTerm = secondTerm;
secondTerm = nextTerm;
}
}
}This Java program generates the Fibonacci series up to n terms, where n is specified by the user. It initializes the first two terms as 0 and 1, respectively, and then iteratively calculates the next term by adding the previous two terms. Finally, it prints each term of the Fibonacci series.
Java method to reverse a given string without using any library functions:
public class ReverseString {
public static void main(String[] args) {
String str = "Hello, World!";
String reversed = reverseString(str);
System.out.println("Original string: " + str);
System.out.println("Reversed string: " + reversed);
}
public static String reverseString(String str) {
char[] charArray = str.toCharArray();
int left = 0;
int right = charArray.length - 1;
while (left < right) {
// Swap characters at left and right indices
char temp = charArray[left];
charArray[left] = charArray[right];
charArray[right] = temp;
// Move pointers towards the center
left++;
right--;
}
// Convert char array back to string
return new String(charArray);
}
}
This Java program takes a string str as input, converts it into a character array, and then iterates through the array from both ends, swapping characters at each position. This process continues until the pointers meet in the middle of the array, effectively reversing the string. Finally, the reversed character array is converted back into a string and returned.
When you run this program with the input "Hello, World!", the output will be:
Original string: Hello, World!
Reversed string: !dlroW ,olleH
Oracle java interview questions:-
What is Java? Explain its key features?
Java is a multiplatform, object-oriented programming language that runs on billions of devices worldwide. It is t is a general-purpose, class-based, distributed, and object-oriented programming language. It is designed to have as lesser implementation dependencies as possible.
What are the key differences between C++ and Java?
C++ and Java both are object-oriented programming languages with some differences.
| C++ | Java |
C++ is platform dependent | Java is platform-independent. |
C++ writes structural programs without using classes and objects | Java is a pure object-oriented language except for the primitive variables. |
C++ doesnโt support documentation comments. | Java supports documentation comment (/**โฆ*/) to create documentation for java code. |
| C++ fully supports pointers. | In Java, there is no concept of pointers. |
C++ supports multiple inheritance. | Java doesnโt support multiple inheritance. |
What is the static keyword?
Static Variables: When used with variables inside a function in C or C++, the static keyword means that the variable retains its value between function calls. For example:
void function() {
static int x = 0;
x++;
printf("%d\n", x);
}
int main() {
function(); // Output: 1
function(); // Output: 2
function(); // Output: 3
return 0;
}
Static Functions:
In C and C++, declaring a function as static restricts its scope to the translation unit in which it is defined. This means the function cannot be accessed from other files in a multi-file program.
Static Classes:
In some object-oriented languages like Java, static is used to define class-level variables and methods. These are shared among all instances of the class and can be accessed without creating an object of the class.
Static Blocks:
In Java, static blocks are used for static initialization of a class. They are executed when the class is loaded into memory.
What is an interface?
An interface, in the context of object-oriented programming, defines a contract for classes to follow. It specifies a set of methods that a class must implement if it claims to implement that interface. Essentially, an interface declares a set of methods that a class must provide, but it does not provide the implementation of those methods.
Declaration:
An interface is declared using a keyword specific to the programming language (e.g., interface in Java, protocol in Objective-C, protocol in Swift).
Methods:
Interfaces contain method signatures but no implementation details. These methods serve as a blueprint for classes that implement the interface.
Implementation:
Any class that implements an interface must provide concrete implementations for all the methods declared in that interface.
Multiple Inheritance:
Many languages allow a class to implement multiple interfaces. This is useful for cases where a class needs to exhibit behaviors defined by different interfaces.
Abstraction and Polymorphism:
nterfaces facilitate abstraction by defining a common set of methods that implementing classes must adhere to. This allows for polymorphic behavior, where objects of different classes implementing the same interface can be treated uniformly.
Contract:
Interfaces establish a contract between the interface and any class that implements it. This contract ensures that any implementing class provides specific functionality as defined by the interface.
Example: In Java, an interface might be defined as follows:
javaCopy code
interface Animal {
void makeSound();
}Any class that claims to implement the Animal interface must provide an implementation for the makeSound() method.
Oracle Interview Process:-
Oracle’s interview process typically consists of several stages, each designed to evaluate different aspects of a candidate’s skills, experience, and fit for the role. While the specific process may vary depending on the position, location, and hiring manager, here is a general overview of what you might expect:
Below is the recruitment process that Iโve gone through.
- Online Test
- Technical Interview 1
- Technical Interview 2
- Technical + HR Round
PAA Questions
How to prepare for an Oracle Java Developer interview?
Oracle Java Developer interview involves focusing on both technical skills related to Java programming and familiarity with Oracle’s technology stack and development practices.
Review Core Java Concepts,Practice Coding, Understand Java Frameworks and Libraries, Learn Oracle Technologies, Review Java EE Concepts, Study Design Patterns, Prepare for Technical Interviews, update your knowledge and tten Mock Interviews
Are Oracle interviews hard?
The hiring process is long and cumbersome, but once at Oracle, you have many opportunities for changing positions and groups.
Oracle interviews can be challenging, particularly for technical roles such as software engineering, database administration, and cloud computing. The difficulty level of Oracle interviews can vary depending on factors such as the role you’re applying for, your level of experience, and the specific interviewers you encounter.
How to pass a Java interview?
If you are preparing for a Java-based interview, itโs a good idea to go through Java Interview Questions. Brush up on object-oriented programming (OOP) principles, such as inheritance, polymorphism, encapsulation, and abstraction. Freshers looking for a job in the software industry should have a good understanding of Java and its concepts.
Does Oracle have a technical interview?
A candidate will have to answer two Oracle interview questions based on data structures and algorithms.More in-depth technical questions covering algorithms, data structures, system design, and possibly domain-specific knowledge based on the role.
Conculsion:-
The interview highlighted the importance of continuous learning and adaptability in the tech industry, as well as the significance of fostering a collaborative and inclusive work environment. Overall, it was an enlightening discussion that shed light on Oracle’s role in shaping the future of technology.
Understanding Oracleโs business and showing enthusiasm for the role can also positively impact your interview outcome.