week1. Introduction

본 포스트의 요약은 제가 현재 학교 수업으로 듣고 있는 객체지향 프로그래밍 및 실습이란 과목입니다.

현 과목에서 저희 수업은 java 언어를 통하여 객체지향 프로그래밍을 배우고 있습니다.

영어로 수업을 배우고 있어서, 모든 요약은 거의 영어로 됩니다.

제 스스로 복습을 위한 정리 공간이지만, 이 글을 읽는 분에게도 도움이 되었으면 합니다.

 

 

◆ Java programming Language

- Simple 

- Safe 

- Paltform-independent("write once, run anywhere")

- Rich library(Package)

- Designed for the internet

 

 

◆ The Structure of a Simple Program

: Class Declaration

- Class : fundamental building blocks of Java Program

public class HelloPrinter

- every source can contain at most one public class

- The name if the public class must match the name of the file containing the class

Class HelloPrinter must be contained in a file named HelloPrinter.java

 

: main Method

- Every Java application contains a class with a main method

declares a main method

pubilic static void main(String[] args)

{

...

}

 

: Comments

- The first line inside the main method is a comment

 

: Statements

- The body of the main method contains statements inside the curly bracket({}).

- Each statement end in a semicolon(;).

- Statements are executed one by one

 

: Method Call

- System.out.println("Hello, world!"); is a method call

=> System.out ( method is invoked on this object): Object

=> println() (name of method) : Method

=> "Hello,World!"  : Parameters

: String

- A sequence of characters enclosed in double quotation marks ("")

 

 

◆ Editing a Java Program

- Java is case-sensitive : distinguish between upper- and lowercase letters

- Lay out your program so that they are easy to read

 

 

◆ Compiling and Running a Java Program

- source code  ---[ Java Compiler ]---> class files contain instruction for the Java virtual machine

- class file has extension .class

 

◆ Errors

 

- Compile-time error : A violation of the programming language rules that is detected by the compiler

ex. System.ou.println("Hello,world!"); -> Syntax error

- Run-time error : Causes the program to take an action that the programmer did not intend

ex. System.out.println("Hello,world!"); System.out.println(1/0); -> Logic error

 

 

◆ Algorithms

- A sequence of steps that is :  *umambiguougs, *executable, *terminating

 

 

◆ Pseudocode : An informal description of an algorithm

 

 

 

 

10주 넘게 수업나갔는데... 이제요약시작 ;

뭐든지 기본 개념이 제일 중요합니다 :)