abstract

# main abstract package  [program.java]

package ex2.abstr;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Scanner;

import ex2.abstr.data.NewlecExam;
import ex2.abstr.ui.NewlecExamConsole;

public class program {

	public static void main(String[] args) throws IOException {
	
	// Exam exam1 = new Exam(); <- Exam 클래스가 abstract 이므로 Exam 의 객체생성 불가능함
	//Exam exam1  = new NewlecExam(1,1,1,1); // <- 자식 클래스의 객체를 통해 Exam 에 접근해야됨
	//int total = exam1.total();
	//double avg = exam1.avg();
	//System.out.println(total);
	//System.out.println(avg);
	
	
	//	NewlecExam exam = new NewlecExam(1,1,1,1);
	//	int total = exam.total();
	//	double avg = exam.avg();
	//	System.out.println(total);
	//	System.out.println(avg);
	
	NewlecExam exam = new NewlecExam(); // exam 클래스가 추상형이라서 exam 객체 생성이 불가능 하여 자식클래스인 NewlecExam 으로 객체선언
	NewlecExamConsole console = new NewlecExamConsole(); // NewlecExam 기업에서는 컴퓨터 과목이 추가되기 때문에 NewlecExam 의 전용 출력 용 인 NewlecExamConsole 클래스 객체 생성
	console.setExam(exam);
	console.input();
	console.print();

		
	}

	
}

 

 

 

# abstract.entitiy package [Exam.java & NewlecExam]

package ex2.abstr.data;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Scanner;

public abstract class Exam { // 뼈대생성
	// 그룹핑
	 private int kor;
	 private int eng;
	 private int math;
	
	 // 생성자
	 public Exam() {
		 this(1,1,1);
	 }

	 public Exam(int kor, int eng, int math) {
		 this.kor = kor;
		 this.eng = eng;
		 this.math = math;
	 }
	 
	 public void load() throws IOException {
		 File file = new File("res/data.txt");
		 FileInputStream fis = new FileInputStream(file);
		 Scanner scan = new Scanner(fis);
		 
		 String[] tmps = scan.nextLine().split(",");
		 
		 scan.close();
		 fis.close();
		 
		 kor = Integer.parseInt(tmps[0]);
		 eng = Integer.parseInt(tmps[1]);
		 math = Integer.parseInt(tmps[2]);

	 }
	
	 public void save() throws IOException {
		 File file = new File("res/data.txt");
		 FileOutputStream fos = new FileOutputStream(file);
		 PrintStream ps = new PrintStream(fos);
		 
		 ps.printf("$d,%d,%d\n", kor, eng, math);
		 
		 ps.close();
		 fos.close();
	 }
	 
	 
	 public int total() {
		 return kor+eng+math;
	 }
	 	 
	 public abstract double avg();
	 // 내가 지금 구현할게 없어서 몸통을 지웠는데 하지만
	 // 목록만큼은 공통분모로 있어야 되기 때문에 추상형으로 했다
	 // 자식은 무조건 이것을 오버라이드하여 구현 해야된다 [가업을 이어라]
	 
	 public void setKor(int kor) {
		 this.kor = kor;
	 }
	 
	 public int getKor() {
		 return kor;
	 }
	 
	 public void setEng(int eng) {
		 this.eng = eng;
	 }
	 
	 public int getEng() {
		 return eng;
	 }
	 
	 public void setMath(int math) {
		 this.math = math;
	 }
	 
	 public int getMath() {
		 return math;
	 }

}

package ex2.abstr.data;

public class NewlecExam extends Exam {
	private int com;
	
	public void setCom(int com) {
		this.com = com;
	}
	
	public int getCom() {
		return com;
	}

//	public void setCom(int com) {
//		this.com = com;
//	}

	public NewlecExam() {
		this(0,0,0,0);
	}

	public NewlecExam(int kor, int eng, int math, int computer) {
		super(kor, eng, math);
		this.com = com;
	}
	
	@Override
	public int total() {
		return super.total()+com; // Exam 의 total 함수 호출
		// kor+eng+math+com
	}

	@Override
	public double avg() {
		return total() / 4.0;
	}
	
	
}

# abstract.ui package [ExamConsole.java & NewlecExamConsole.java]

package ex2.abstr.ui;

import java.util.Scanner;

import ex2.abstr.data.Exam;

public abstract class ExamConsole {
	
	private Exam exam;
	
	public ExamConsole() {
		// 1. Compositon Has A 관계
		// this.exam = new Exam();
	}
	
	public ExamConsole(Exam exam) {
		this.exam = exam;
	}
	
	public Exam getExam() {
		return exam;
	}
	
	//1. Association Has A 관계
	public void setExam(Exam exam) {
		this.exam = exam;
	}
	
	  public void print() {
		
		Scanner scan = new Scanner(System.in);
		
		System.out.println("┌───────────────────────────────────┐");
		System.out.println("│              성적 출력              │");
		System.out.println("└───────────────────────────────────┘");
		System.out.println("국어 : " + exam.getKor());
		System.out.println("영어 : " + exam.getEng());
		System.out.println("수학 : " + exam.getMath());
		
		onPrint();
		
		int total = this.exam.total();
		double avg = this.exam.avg();
		System.out.println("총점 :" + total);
		System.out.printf("평균 : %.2f\n", avg);
		
	}	
	  
	protected abstract void onPrint();
	
	  	
	public void input() {
		Scanner scan = new Scanner(System.in);
		System.out.println("┌────────────────────────────────┐");
		System.out.println("│      			성적 입력          │");
		System.out.println("└────────────────────────────────┘");
		
		System.out.print("국어 >");
		int kor = scan.nextInt();
		System.out.print("영어 >");
		int eng = scan.nextInt();
		System.out.print("수학 >");
		int math = scan.nextInt();
		
		exam.setKor(kor);
		exam.setEng(eng);
		exam.setMath(math);
	
	}
}

package ex2.abstr.ui;

import java.util.Scanner;

import ex2.abstr.data.NewlecExam;

public class NewlecExamConsole extends ExamConsole {

	@Override
	protected void onPrint() {
		NewlecExam exam = (NewlecExam)getExam();
		System.out.println("컴퓨터 :" + exam.getCom());
	}
	
	
	@Override
	public void input() {
		
		super.input();
		
		Scanner scan = new Scanner(System.in);
		System.out.print("컴퓨터 > ");
		int com = scan.nextInt();
		
		NewlecExam exam = (NewlecExam)getExam();
		exam.setCom(com);
	}

	
	
}