ClickSoftware Interview Questions and Answers

Java programming language

Q1. What is object oriented programming
Ans. 
Object oriented programming is a programming paradigm that uses objects to represent and manipulate data.
• OOP focuses on encapsulation, inheritance, and polymorphism

• Objects have attributes (data) and methods (functions)

• Java, C++, and Python are popular OOP languages

• Example: A car object has attributes like color and model, and methods like start and stop
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Q2. What is data types and types of data type
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Data types are classifications of data items based on their characteristics.
• Data types define the type of data that a variable can hold

• Java has two categories of data types: primitive and non-primitive

• Primitive data types include int, double, boolean, char, etc.

• Non-primitive data types include arrays, classes, interfaces, etc.
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Q3. Define collection and examples
Ans. 
A collection is a group of objects that can be stored, manipulated, and retrieved as a single unit.
• Collections are used to store and manipulate groups of related objects

• Examples include ArrayList, LinkedList, HashSet, TreeMap

• Collections can be sorted, searched, and filtered
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Q4. Explain condition statements
Ans. 
Condition statements are used to execute code based on certain conditions being met.
• Condition statements are typically written using if, else if, and else keywords

• The condition inside the if statement must evaluate to true for the code inside the block to be executed

• Multiple conditions can be checked using logical operators such as && (and) and || (or)

• Switch statements are another way to execute code based on condition...read more
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Q5. Explain servlets and xmls
Ans. 
Servlets are Java classes that handle HTTP requests and responses. XML is a markup language used for data exchange.
• Servlets are server-side components that generate dynamic web content.

• XML is used to store and transport data between systems.

• Servlets can be used to handle form submissions, authentication, and session management.

• XML can be used to define data structures, configuration files, and web services.

• Servlets are...read more
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Q6. Write a programming language in java
Ans. 
A programming language in Java
• Define a grammar for the language

• Implement a lexer to tokenize the input

• Use a parser to build an abstract syntax tree

• Implement a type checker to ensure type safety

• Generate bytecode or machine code from the AST

• Provide a runtime environment to execute the code
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Q7. What is arrays, strings and classes
Ans. 
Arrays, strings, and classes are fundamental concepts in Java programming.
• Arrays are collections of similar data types that can be accessed using an index.

• Strings are sequences of characters that are immutable in Java.

• Classes are templates for creating objects that encapsulate data and behavior.

• Arrays and strings are both objects in Java.

• Classes can be used to create custom data types and define their behavior.
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Q8. Difference between classes and objects
Ans. 
Classes are blueprints for objects, while objects are instances of classes.
• Classes define the properties and behaviors of objects

• Objects are created from classes and have their own unique values for properties

• Classes can be thought of as a template or a blueprint

• Objects are created using the 'new' keyword followed by the class name

• Classes can have static properties and methods, while objects cannot
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Q9. Control statements in js
Ans. 
Control statements in JavaScript are used to control the flow of execution of a program.
• if-else statements

• switch statements

• for loops

• while loops

• do-while loops

• break and continue statements
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Q10. Explain operators types
Ans. 
Operators are symbols that perform operations on operands in a programming language.
• Arithmetic operators: +, -, *, /, %

• Relational operators: <, >, <=, >=, ==, !=

• Logical operators: &&, ||, !

• Bitwise operators: &, |, ^, ~, <<, >>, >>>

• Assignment operators: =, +=, -=, *=, /=, %=

• Conditional operator: ? :
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