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Java
  • 자바의 역사
  • Ch1
    • Before Start Java
      • History of Java
      • Feature of Java
      • API Documentation
      • Hello World!
      • eclipse shortcut
      • Eclipse IDE
      • GitHub to eclipse
  • Ch2
    • Variable
      • Variable
    • Variable Type
    • Character and String
    • Primitive type and range
    • printf and formatter
    • Scanner
    • Overflow of Int
    • Transition between different variable types
    • Object Array
  • CH3
    • Operator
  • CH4
    • 조건문과 반복문
    • if statement
    • switch
    • Math.random()
    • for statement
    • while statement
    • break, continue, named iterated statement
  • CH5
    • Array
    • 배열 활용
    • String Array
  • OOP
    • Intro
  • Class and Object
  • Make multiple Classes in one file
  • How to use Object
  • Object Array
  • Variable type according to declared location
  • Class Variable and Instance Variable
  • Method
  • Call Stack
  • Parameter
  • Static method(Class method) and Instance method
  • (Method)Overloading
  • Constructor
  • Constructor this()
  • Reference type variable "this"
  • Initialize variable
  • Inheritance
  • Composite
  • Single Inheritance, Object Class
  • (Method)Overriding
  • super, super()
  • package, class path
  • import, static import
  • modifier
  • access modifier
  • Encapsulation
  • Polymorphism
  • reference type transition
  • instanceof operator
  • Parameter polymorphism
  • Multiple object using one array
  • Abstract Class, Abstract Method
  • Creating Abstract Class
  • Interface
  • Interface Polymorphism
  • Interface Pros
  • Default method and static method
  • Inner Class
  • Anonymous Class
  • java.lang package and useful class
    • Object class
    • hashCode(), toString()
    • String class
    • StringBuffer class
    • StringBuilder class
    • Math class
    • Wrapper class
    • Number class
    • String to Number, String to Wrapper class
    • Auto-boxing and (auto)Unboxing
  • Collection Framework
    • Collections framework
    • List, Set, Map Interface
    • List의 removeAll() 과 clear() 비교
    • List Interface - ArrayList
    • How to view Java API source
    • List Interface - LinkedList
    • Stack and Queue
    • Iterator, ListIterator, Enumeration
    • Array
    • Comparator와 Comparable
    • Stack
    • String
    • String + char = String
    • String.toCharArray()
    • BufferedReader / BufferWriter
    • Scanner로 String 입력 - next( )와 nextLine( )
    • 공백없이 2차원배열 데이터 String으로 한번에 한줄씩 입력받기(문자/숫자)
    • 공백을 사이에 두고 빠른 2차원 배열 입출력
    • arr[index++]과 arr[index] index++의 차이
    • int와 long의 차이
    • Untitled
    • 타입 간의 변환
    • Array 와 ArrayList
    • valueOf()
    • Char
    • 변수, 객체 초기화(초기값 설정)
  • error troubleshooting
    • No enclosing instance of type
    • ASCII Code Table
    • java.lang.NumberFormatException
    • No enclosing instance..
  • reference
    • String을 생성하는 2가지 방법과 차이점
    • StackOverflowError(스택, 힙 메모리)
    • swtich-case 반복문
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Method

Call Method, Flow of Method

  • How to use method?

  1. 메소드(클래스) 작성 : 메소드는 클래스 영역에서만 정의할 수 있다.

  2. 인스턴스(객체) 생성 : 메소드(클래스)를 사용하기 위해! 사용 = 접근, 조작 등등

  3. 메소드 호출

//1.메소드(클래스) 작성
Class MyMath {...}
//2. 인스턴스 생성
Mymath mm = new MyMath();
//3. 메소드 호출
(Mymath return type) result = mm.add(1L,2L);
  • return statement

return statement can be omitable only void type. Otherwise, return statement is essential.

Not only when if statement is true, include return statement when it is false.

class MyMath {
    int max(int a, int b) {
        if(a > b)
            return a;//when condition is true
        else
            return b;//when condition is false
    }
}
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Last updated 4 years ago

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