Jd Construction Interview Questions and Answers

Its was moderate , basic questions and can written based on the cluster

It was easy its an combination of aptitude and gaming questions

Q1. What is Java, and why is it considered platform-independent?
Ans. 
Java is a programming language known for its platform independence due to its ability to run on any device with a Java Virtual Machine (JVM).
• Java is a high-level programming language developed by Sun Microsystems.

• It is considered platform-independent because Java programs are compiled into bytecode that can run on any device with a JVM.

• JVM acts as an interpreter that translates the bytecode into machine code specific t...read more
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Q2. What are the differences between method overloading and method overriding?
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Method overloading involves multiple methods in the same class with the same name but different parameters. Method overriding involves a subclass providing a specific implementation of a method that is already provided by its superclass.
• Method overloading is resolved at compile time based on the method signature, while method overriding is resolved at runtime based on the object type.

• Method overloading is used to incre...read more
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Q3. What is the program for checking if a string is a palindrome?
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A program to check if a string is a palindrome involves comparing the string with its reverse.
• Iterate through the string from both ends and compare characters.

• If all characters match, the string is a palindrome.

• Examples: 'radar' is a palindrome, 'hello' is not.
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Q4. Program for checking if given number is prime or not ?
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A program to check if a given number is prime or not.
• Iterate from 2 to square root of the number and check for divisibility

• If the number is divisible by any number other than 1 and itself, it is not prime

• Optimization: Check divisibility only up to square root of the number
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Q5. What are the different types of Structured query Languages (SqL)?
Ans. 
Different types of SQL include MySQL, PostgreSQL, SQLite, Oracle SQL, and Microsoft SQL Server.
• MySQL - widely used open-source SQL database management system

• PostgreSQL - advanced open-source SQL database management system

• SQLite - self-contained, serverless, zero-configuration SQL database engine

• Oracle SQL - proprietary SQL database management system by Oracle Corporation

• Microsoft SQL Server - relational database manage
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Q6. Given an scenario to write sql query ?
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Q7. An aptitude question based on time and work
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Q8. What is the code for calculating the length of a rectangle given its breadth and area?
Ans. 
The code for calculating the length of a rectangle given its breadth and area involves dividing the area by the breadth.
• Calculate length = Area / Breadth

• For example, if the breadth is 5 and the area is 20, then the length would be 20 / 5 = 4
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Q9. What are the different types of data types in Java?
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Java has primitive data types (int, double, boolean, etc.) and reference data types (arrays, classes, interfaces, etc.)
• Primitive data types include int, double, boolean, char, etc.

• Reference data types include arrays, classes, interfaces, etc.

• Examples: int num = 10; double price = 19.99; boolean isTrue = true; String name = "John";
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Q10. What are the differences between the Java Virtual Machine (JVM), Java Runtime Environment (JRE), and Java Development Kit (JDK)?
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JVM executes Java bytecode, JRE includes JVM and libraries, JDK includes JRE and development tools.
• JVM is responsible for executing Java bytecode and providing a runtime environment.

• JRE includes JVM along with libraries and other components necessary to run Java applications.

• JDK includes JRE and development tools like compilers and debuggers for creating Java applications.

• JDK is required for developing Java application...read more
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Q11. What is a primary key in SQL?
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A primary key in SQL is a unique identifier for each record in a table.
• Primary key ensures each record in a table is unique

• It can be a single column or a combination of columns

• Primary key values cannot be NULL

• Example: 'id' column in a 'users' table
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Q1. Run time polymorphism code
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Q2. Linked list code
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Q3. Deep copy shallow copy differences
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Deep copy creates a new copy of an object with its own unique memory space, while shallow copy creates a new object that references the same memory locations as the original object.
• Deep copy duplicates all nested objects, while shallow copy only duplicates the references to nested objects.

• Deep copy ensures that changes to the copied object do not affect the original object, while shallow copy may lead to unintended sid...read more
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Q1. More deep questions about polymorphism code
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Q2. Code for interchange of strings without strcpy
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Use a loop to swap characters of two strings without using strcpy function.
• Create two arrays of characters to store the strings

• Use a loop to iterate through each character of the strings and swap them

• Ensure to handle cases where strings have different lengths
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