Key Notes per Week

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Week 1

Basics

• Primitive - 8 types
• String (3 methods)
• if, else if, else
• for loop + if else
• operator (>, <, >=, <=, ==, !, &&, ||)
• break, continue
• switch - lower priority
• nested loop - lower priority

Advanced

N/A

Week 2

Basics

• Methods (Static)
• Array (17 types)
• String (> 10 methods) - for loop
• Wrapper Class - 8 classes (Converison)
• for-each loop
• Primitive (Upcast/ Downcast) -> overflow
• While Loop
• ASCII - char/ int
• Pass by reference/ Pass by value (low priority)
• Do-while Loop (low priority)

Advanced

• Sorting - Bubble, insertion
• String Literal
• Integer Cache
• Stack & Heap memory (object)
• Scanner, Random

Week 3

• Instance Method

  • 1. Belongs to the object (Person p1 = new Person(); p1.swim();)
  • 2. Able to control the instance variable by "this"

• Static Method

  • 1. Belongs to the class (ClassName.staticMethod() -> Person.swim(3))
  • 2. Not able to read/write instance variable
  • 3. The return value completely derived by the input parameters

Week 4

• extends
  • Parent class (Normal Class and Abstract Class). Their Difference
  • Make sure you know the limitations of using "extends"
  • pros and cons 優點和缺點
• implements
  • Interface (100% abstract)
  • Make sure you can create, modify, understand impact between class and inter face
  • pros and cons 優點和缺點
• Object.class (Parent)
• Object Reference Type vs Object Type
• What if "Object Reference Type" is a parent of "Object Type"?
• Whay if "Object Type" is a parent of "Object Reference Type"?
• Object obj = new ChildClass(); (What are the implications)
• Enum

Week 5

• DS
  • List - ArrayList, LinkedList
  • Queue - LinkedList, ArrayDeque
  • Set - HashSet
  • Map - Hash Map
  • Stack, PriorityQueue (less important)
• Hash DS (equals() & hashCode())
• Comparator & Comparable (Interface Control on method parameter - Collections.sort())