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

noun : accountNum, password , restMoney, interest object name : account noun : accountNum, password , restMoney, interest verb: saveMoney , withdrawMoney , getRestMoney public class Account {          private String accountNum = "422-01-0903895";          private String password = "12345678";          private long restMoney = 34123415;          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; }

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());           } }

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

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 []; }