자바 스터디 4주차 - 클래스와 객체, 상속

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package org;

public class Company {
    String name;
    Department[] departments;
    String location;
    int assets;
    double growthRate;

    public Company(String name, Department[] departments, String location, int assets, double growthRate) {
        this.name = name;
        this.departments = departments;
        this.location = location;
        this.assets = assets;
        this.growthRate = growthRate;
    }

    public Company(){
        System.out.println("새로운 회사 탄생");
    }

    public int calcSalary(){
        int sum = 0;
        for (Department department : departments) {
            sum += department.getSalary() * department.getNumOfPeople();
        }
        return sum;
    }
    public String giveSalary(){
        this.assets -= calcSalary();
        return "지급 후 자산: " +  assets;
    }
    public String introduceCompany(){
        return "저희 회사는 " + name + "이고 " + location + "에 위치하고 있습니다.\n저희회사는 " + growthRate + "% 의 성장률을 보이고 있습니다.";
    }

    public int getAssets() {
        return assets;
    }

    public void setAssets(int assets) {
        this.assets = assets;
    }
}

 

package org;

public class Department {
    private String name;
    private int numOfPeople;
    private int salary;

    public Department(String name, int numOfPeople, int salary) {
        this.name = name;
        this.numOfPeople = numOfPeople;
        this.salary = salary;
    }
    public Department(){}

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getNumOfPeople() {
        return numOfPeople;
    }

    public void setNumOfPeople(int numOfPeople) {
        this.numOfPeople = numOfPeople;
    }

    public int getSalary() {
        return salary;
    }

    public void setSalary(int salary) {
        this.salary = salary;
    }
}

 

package org;

public class FinalAndStatic {
    private static int sum;
    public static final double PI = 3.14;
    private final int cantModify;
    FinalAndStatic(int cantModify){
        this.cantModify = cantModify;
    }
    public static int sum(int[] array){
        sum = 0;
        for (int i : array) {
            sum += i;
        }
        return sum;
    }
    public static double average(int[] array){
        sum = 0;
        for (int i : array) {
            sum += i;
        }
        return (double)(sum / array.length);
    }
    public static double getWidth(int r){
        return r * r * PI;
    }
}

 

package org;

public class Kakao extends Company {
    private String[] appName = {"카카오톡", "카카오뱅크", "카카오택시", "카카오지하철", "카카오버스"};

    public Kakao(String name, Department[] departments, String location, int assets, double growthRate, String[] appName) {
        super(name, departments, location, assets, growthRate);
        this.appName = appName;
    }

    public Kakao(){
        super();
    }

    @Override
    public String introduceCompany(){
        return "저희는 카카오입니다.";
    }
    public String introduceApps(){
        String introduce = "";
        for (String s : appName) {
            introduce += s + " ";
        }
        return "저희가 개발한 앱으로는 " + introduce + "등이 있습니다.";
    }
//    public void setAssets(int assets){
//        this.assets = assets;
//        System.out.println("완료");
//    }
}

 

package org;

public class Naver extends Company{
    public Naver(String name, Department[] departments, String location, int assets, double growthRate) {
        super(name, departments, location, assets, growthRate);
    }

    public Naver() {

    }

}

 

package org;

public class Run {
    public static void main(String[] args) {
        System.out.println(FinalAndStatic.PI);
        int[] numArray = {1, 2, 3};
        System.out.println(FinalAndStatic.average(numArray));
        System.out.println(FinalAndStatic.sum(numArray));
        System.out.println(FinalAndStatic.getWidth(10));
        System.out.println();
        System.out.println();

        Department software = new Department("개발", 10, 5000);
        Department planning = new Department("기획", 4, 4500);
        Department promotion = new Department("홍보", 5, 4000);
        Department[] dArray = {software, planning, promotion};
        Company tuk = new Company("한국공학회사", dArray, "시흥", 5000000, 50);
        System.out.println(tuk.calcSalary());
        System.out.println(tuk.getAssets() + "-" + tuk.calcSalary() + " = " + tuk.giveSalary());
        System.out.println();
        System.out.println();


        String[] appName = {"카카오톡", "카카오뱅크", "카카오택시", "카카오지하철", "카카오버스"};
        Kakao k = new Kakao("카카오Inc", dArray, "강남", 1000000, 300, appName);
        System.out.println(k.getAssets());
        System.out.println(k.introduceApps());
        System.out.println();

        Naver n = new Naver();
        System.out.println();

        Company kakao = new Kakao();
        Company naver = new Naver();
        System.out.println(kakao.introduceCompany());
        kakao.setAssets(1000);
        System.out.println(kakao.getAssets());
        ((Kakao) kakao).introduceApps();
        if(kakao instanceof Company){
            System.out.println("Company");
        }
        else{
            System.out.println("Kakao");
        }
    }
}