Java Examples

Basics:

1. Code structure:

   1. Java executable class.
   2. Variables: Scope, kinds and types (Primitives and Non-primitive).
   3. Class structure: methods, variable, nested types, init blocks.
   4. Arrays
   5. Package & classes.
   6. Memory: Heap & stack, garbage collection, static VS non-static.

2. Control flow:

   1. Conditions: if, if-else, if-else-if-else and ternary statement.
   2. Loops: while-do, do-while, for(C-style), foreach.
   3. Switch: case-break & fall-through.
   4. Recursion VS loop.

3. Object Oriented Programming:

   1. Inheritance
   2. Encapsulation
   3. Polymorphism
   4. Abstraction
   5. Composition
   6. Loose coupling
   7. High cohesion

Advanced:

1. Collections:

   1. Generics Generics
   2. Collection interface and its common sub-classes: ArrayList, LinkedList, HashSet, TreeSet, HashMap, TreeMap
   3. Common conversions

2. String manipulations:

   1. Understanding java.lang.String class
   2. Understanding java.lang.StringBuilder class
   3. Understanding java.lang.StringBuffer class

3. Regular Expressions

   1. Quantifiers, predefined meta chars, patterns and symbols, capturing ,looks (positive & negative, ahead & behind)
   2. Common usage: match, split, replace

4. Exception handling:

   1. Throwable tree - hierarchy
   2. Error VS Exception
   3. Checked VS Unchecked Exceptions
   4. try blocks: try-catch, try-finally, try-catch-finally, multiple-catch, try with resources
   5. Rethrowing concept
   6. Custom Exception

5. Multi threading:

   1. Concurrency VS parallelism
   2. Process & thread
   3. java.lang.Runnable & java.lang.Thread
   4. Thread handling

6. Enumeration:

   1. Enum type structure: instances, constructors, methods & properties
   2. Singleton implementation
   3. State machine
   4. Abstraction & Polymorphism: Interface implementation and nested methods delegation

7. Working with files

   1. Understanding java.io.File class
   2. Working with streams (Input & Output)
   3. Files.ReadAllBytes VS FileInputStream VS BufferedReader