java technical interview cheat sheet
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java technical interview cheat sheet
preparing for a java technical interview can be daunting, but having a cheat sheet can help you focus on key concepts and commonly asked questions. this tutorial will cover important topics, code examples, and concepts you should review before your interview.
#### 1. *core java concepts*
*a. object-oriented programming (oop) principles*
**encapsulation**: bundling data with methods that operate on that data.
**inheritance**: mechanism where a new class is derived from an existing class.
**polymorphism**: ability to process objects differently based on their data type or class.
**abstraction**: hiding complex implementation details and showing only the essential features.
*example:*
*b. exception handling*
use `try`, `catch`, `finally` for handling exceptions.
`throw` is used to explicitly throw an exception.
`throws` is used in method signatures to indicate that a method can throw exceptions.
*example:*
#### 2. *collections framework*
java collections framework provides a set of classes and interfaces for storing and manipulating groups of objects.
*common interfaces:*
`list`
`set`
`map`
*example:*
#### 3. *multithreading*
java supports multithreading through the `thread` class and the `runnable` interface.
synchronization is used to control access to shared resources.
*example:*
#### 4. *java 8 features*
*a. lambda expressions*
provide a clear and concise way to represent a function interface using an expression.
*example:*
*b. streams*
a sequence of elements supporting sequential and parallel aggregate operations.
*example:*
#### 5. *common design patterns*
*a. singleton pattern*
ensures a class has only one instance and provides a global point of access to it.
*example:*
*b. factory pattern*
defines an interface for creating an object but lets subclasses alter the type of objects that will be created.
*example:*
#### 6. ...
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