Print

// Print ---부모 객체.
package ch10_interface;

public interface Print {
	
	int START = 1;
	int CANCEL = 2;
	
	// 인터페이스에 default abstract로 설정됌.
	// public abstract void printStart();
	public void printStart();
	public void printCancel();
}
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// Scan  ---Print 자식 객체.
package ch10_interface;

public class Scan implements Print{
	
	@Print_Override
	public void printStart() {
		System.out.println("- 스캔 시작 -");
	}

	@Print_Override
	public void printCancel() {
		System.out.println("- 스캔 취소 -");
	}
	
}
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// Printer ---Print 자식객체.
package ch10_interface;

public class Printer implements Print{

	@Override
	public void printStart() {
		System.out.println("- 프린터 출력 시작 -");
	}

	@Override
	public void printCancel() {
		System.out.println("- 프린터 출력 취소 -");
	}
	
	
}
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//PrintMachine -- 행위 구현 메소드.
package ch10_interface;
import java.util.Scanner;

public class PrintMachine {
	
	private Print current; // 현재 사용중인 장치.
	private int device;    // 1.프린터 2.스캐너
	private Printer printer;
	private Scan scan;
	private Scanner scanner;
	
	public PrintMachine() {
		printer = new Printer();
		scan = new Scan();
		device = 1;
		current = printer;
		scanner = new Scanner(System.in);
	}
	
	// 메뉴
	public boolean modeSelect() {
		System.out.print("1.장치 선택  2.인쇄/취소 >> ");
		int mode =scanner.nextInt();
		switch(mode) {
		case 1: // 장치선택
			selectDevice();
			break;
		case 2: // 인쇄,취소
			printRun();
			break;
		case 0: // 종료
			return false;
		}
		System.out.println();
		return true;
	}
	
	// 장치 선택
	public void selectDevice() {
		System.out.print("1.프린터   2.스캐너  >> ");
		device = scanner.nextInt();
		
		if(device == 1)
			current = printer;
		else if(device == 2)
			current =scan;
	}
	
	// 인쇄,취소
	public void printRun() {
		System.out.print("1.시작   2.취소 >> ");
		int select = scanner.nextInt();
		switch(select) {
		case Print.START:
			current.printStart();
			break;
		case Print.CANCEL:
			current.printCancel();
			break;
		}
	}
	
}
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// PrintMain -- 메인 함수
package ch10_interface;

public class PrintMain {
	
	public static void main(String[] args) {
		PrintMachine pm = new PrintMachine();
		
		boolean run = true;
		while(run) {
			run = pm.modeSelect();
			System.out.println();
		}
		System.out.println("- Power OFF -");
	}
}