Extended Web AppTech Java Developer Interview Questions and Answers

The codinds questions were too easy.

Q1. Cover the OOPS, Exception Handling, Collections,Arrays, Strings
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Q1. OOPS, Exception Handling, Collections, Arrays, Strings
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Q2. What is Interface
Ans. 
Interface in Java is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types.
• Interfaces are used to define a contract for classes that implement them.

• Classes can implement multiple interfaces in Java.

• Interfaces cannot have instance fields, constructors, or non-static methods.

• Example: interface Shape { void draw(); }

• Example: class Circle...read more
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Q3. What is Abstractin
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Abstraction is a concept in object-oriented programming where only relevant data is shown to the user while hiding unnecessary details.
• Abstraction helps in simplifying complex systems by only showing essential features.

• It allows for creating abstract classes and interfaces in Java.

• Example: In a car, the driver only needs to know how to drive it without understanding the internal workings of the engine.
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Q4. Explain about Exception and Exception handling
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Exceptions are unexpected events that disrupt the normal flow of a program. Exception handling is the process of dealing with these events.
• Exceptions are objects that represent an abnormal condition or error in a program.

• Exception handling allows developers to gracefully handle errors and prevent the program from crashing.

• Java provides try-catch blocks for handling exceptions. The try block contains the code that may t...read more
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Q5. Explain Arrays and Strinds
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Arrays are a collection of elements of the same data type, while Strings are a sequence of characters.
• Arrays can store multiple values of the same data type, accessed by index.

• Strings are immutable sequences of characters, can be manipulated using various methods.

• Example: int[] numbers = {1, 2, 3}; String name = "John";
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18 non technical MCQ question with Aptitude, English

Q1. Check Palindrome
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A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
• Create a function to check if a given string is a palindrome.

• Remove all non-alphanumeric characters and convert the string to lowercase before checking.

• Compare characters from both ends of the string to determine if it is a palindrome.
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Q2. Compare the object using Instance of Keyword
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Instance of keyword is used to compare an object to a specified class type.
• Instance of keyword returns true if the object is an instance of the specified class.

• It can be used to check if an object is of a specific class type before casting.

• Example: if(obj instanceof String) { // do something }
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Q3. Method overloading and Method Overriding program
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Q1. What is zero coupon bond?
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A zero coupon bond is a bond that pays no interest and is sold at a discount to its face value.
• Zero coupon bonds are also known as discount bonds.

• Investors buy these bonds at a price lower than their face value and receive the full face value at maturity.

• The difference between the purchase price and the face value is the investor's return.

• Zero coupon bonds are often used for long-term investments, such as retirement sa...read more
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Q2. What is corporate actions and how you record those in books?
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Corporate actions are events initiated by a company that can affect its stock price and shareholders. They are recorded in books through various accounting entries.
• Corporate actions include stock splits, dividends, mergers, acquisitions, and spin-offs.

• These actions are recorded in books through journal entries and adjustments to accounts such as retained earnings and stockholders' equity.

• For example, if a company decla...read more
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Basic aptitude is not hard and not to easy

Q1. Asked questions from C,Java,DS basic questions
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Q2. What is linked lists,what is multiple inheritance,what is compiler and interpreter and where they both are used
Ans. 
Linked lists are data structures where each element points to the next element. Multiple inheritance is when a class inherits from more than one parent class. A compiler translates source code into machine code, while an interpreter executes code line by line.
• Linked lists are used to store data in a linear sequence, with each element pointing to the next one.

• Multiple inheritance allows a class to inherit attributes and...read more
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Q3. They show some codes and we need to explain that code clearly with correct output
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Q1. Array manipulatio code wap
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Q2. String reverse wap
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It was moderate. Can clear easily.

Q1. They asked about what whatever skills you written in resume.
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