1. Object Oriented Programming.
Kwangwoo Choi
Department of Physics
Kangwon National University
Object
Something perceptible by one or more of the senses, especially by vision or touch; a material thing.
2. OOP(Object Oriented Programming)
3. Abstract
4. Class
5. encapsulation
6. inheritance
7. polymorphism

2. noun : accountNum, password , restMoney, interest
object name : account
noun : accountNum, password , restMoney, interest
verb: saveMoney , withdrawMoney , getRestMoney
public class Account {
         private String accountNum = " ";
         private String password = " ";
         private long restMoney = ;
         private float interest = 3.34F;
         public void saveMoney(long amount) {
                      restMoney = restMoney + amount;
         }
         public void withdrawMoney(long amount) {
         restMoney = restMoney - amount;
          }
         public long getRestMoney() {
                      return restMoney;
         public void setInterest(float newInterest) {
                      interest = newInterest; }

3. Make Object Account x; x = new Account(); Account x= new Account()
public class Bank {
         public static void main(String [] args) {
                     Account x = new Account();
                     x.saveMoney(100);
                     x.withdrawMoney(50);
                    System.out.println(x.getRestMoney());
          } }

4. Encapsulation private String creaditCardNo; // private member
        public class Encapsulation {
              private String creaditCardNo; // private member
             public void setCreaditCardNo(String str) {
             creaditCardNo = str;
                  }
          public String getCreaditCardNo() {
                    return creaditCardNo;
                 }  }
• public
• protected
• default
• private

5. Inheritance class Employee { String name; Date hireDate;
         Date dateOfBirth; }
class Manager {
       String name;
       Date hireDate;
       Date dateOfBirth;
       String department;
       Employee subordinamtes [];
class Employee {
      String name;
      Date hireDate;
     Date dateOfBirth;  }
class Manager extends Employee{
      String department;
      Employee subordinamtes []; }