OOP in Java

Access Modifiers in Java

1. Default – No keyword required

2. Private

3. Protected

4. Public

Source: Access Modifiers in Java

Non-access modifiers

• static
• final

  • variable - to create constant variables

  • method - prevent method overriding

  • class - prevent inheritance

• abstract

• synchronized

  • http://tutorials.jenkov.com/java-concurrency/synchronized.html

• transient
• volatile
• native

Generics

Type Parameter Naming Conventions

By convention, type parameter names are single, uppercase letters. This stands in sharp contrast to the variable naming conventions that you already know about, and with good reason: Without this convention, it would be difficult to tell the difference between a type variable and an ordinary class or interface name.

The most commonly used type parameter names are:

• E - Element (used extensively by the Java Collections Framework)

• K - Key

• N - Number

• T - Type

• V - Value

• S,U,V etc. - 2nd, 3rd, 4th types