Java

• Use UPPER class for the class name
• Namespace: divide different functions, etc.
  • Shadowing: declare the same para as the passing one -> error: misleading
  • Order of declarations doesn't matter (unlike C)

Abstract Data Types (ADT) (distinguished from primitive non-object types)

• key idea: information hiding
  • ADT = data + operation (interface to work with itself)
  • benefits x2: (mainly for clients)
    1. client doesn't need to understand the implementation
    2. implementation change doesn't affect clients
• Fixed bytes (unlike C depending on compilers and OS)
• Don't use floating points for money! (use 2 int instead)

Java collection

Comparison with C

Garbaging

• C: manually allocate & garbage (new & delete, malloc & free)
• Java: Use new and no free, creating pointers (use . Instead of -> inside the class methods though), therefore very safe & hides everything

Static keyword

• static: indicates the class method, invoked as ClassName.methodName()
• non-static: instance method, use this instead or just drop this. if you don't shuttle Not accessible outside if not public

Method Definition Order

• for Java, methods may appear in any order (called before definition is allowed) unlike C
• same rules within the function (the variable declaration orders)

Conditionals