zawawimanja / LearnJava

Java

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Basic

1. foreach -loop array
2. byte - 128 127
3. for loop -know number of loops
4. Array - size cannot modified,cannot add,remove
5. Array List - access random items frequently, add or remove elements at the end of the list

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1. Application Server - TOMCAT
2. Frameworks - Spring Boot, Spring MVC
3. Database = PostgreSQL , MySQL
4. Unit Test - Junit

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OOP

1. encapsulation - put set/get
2. inheritance - extends keywords, create main object and use other method from class that inherited
3. polymorphism - like inheritance, extends keywords, same method but different output
4. abstraction - cannot create object,abstract & extends keywords,no method body in abstract class

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1. Constructor - to initialize value
2. Inner class - in the outer class
3. interface - like abstract ,implement keywords,no method body in interface class