느슨한결합에대한이해 + 스프링 DI할용

spring/di/Program.java

@@ -1,17 +1,18 @@
 package spring.di;
 
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
 import spring.di.entity.Exam;
 import spring.di.entity.NewlecExam;
 import spring.di.ui.ExamConsole;
-import spring.di.ui.GridExamConsole;
-import spring.di.ui.InlineExamConsole;
 
 public class Program {
 
 	public static void main(String[] args) {
 
 		Exam exam = new NewlecExam();
-		ExamConsole console = new InlineExamConsole(exam); // DI
+		//ExamConsole console = new InlineExamConsole(exam); // DI
 		//ExamConsole console = new GridExamConsole(exam);
 
 		/*
@@ -21,6 +22,19 @@ public class Program {
 			같은 메서드를 호출하게되는 위 코드의 수정을 대신해줄 수 있도록 하는 기능이 Spring의 DI다.
 
 		 */
+		
+		// 해당 클래스 사용하기위해서
+		// Maven 프로젝트로 바꿔서 빌드툴을 사용하도록 하였고
+		// Maven Repository에가서 Spring context를 dependency해주었음.
+		ApplicationContext context = 
+				new ClassPathXmlApplicationContext("spring/di/setting.xml");
+
+		
+		//ExamConsole console = (ExamConsole)context.getBean("console");
+		ExamConsole console = context.getBean(ExamConsole.class);
+		console.setExam(exam);
+		
+		
 		console.print();
 
 	}

spring/di/Student.java

@@ -0,0 +1,22 @@
+package spring.di;
+
+import spring.di.entity.CableMouse;
+import spring.di.entity.Mouse;
+import spring.di.ui.Computer;
+
+public class Student {
+
+	public static void main(String[] args) {
+		
+		Computer computer = new Computer();
+		
+		Mouse mouse = new CableMouse(); // 유선마우스
+		//Mouse mouse = new WireLessMouse(); // 무선마우스
+		
+		// 작업을 위한 준비. 마우스 연결
+		computer.connectMouse(mouse);
+		// 연결확인
+		computer.mouseCheck();
+		
+	}
+}

spring/di/entity/CableMouse.java

@@ -0,0 +1,20 @@
+package spring.di.entity;
+
+public class CableMouse implements Mouse{
+	@Override
+	public void clickR() {
+		System.out.println("[ 유선 R ]");		
+	}
+
+	@Override
+	public void clickL() {
+		System.out.println("[ 유선 L ]");	
+	}
+
+	@Override
+	public void mouseCheck() {
+		System.out.println(" 유선마이스 연결 확인 ");
+		clickR();
+		clickL();
+	}
+}

spring/di/entity/Mouse.java

@@ -0,0 +1,10 @@
+package spring.di.entity;
+
+public interface Mouse {
+	
+	void clickR();
+	void clickL();
+	
+	void mouseCheck();
+
+}

spring/di/entity/WireLessMouse.java

@@ -0,0 +1,22 @@
+package spring.di.entity;
+
+public class WireLessMouse implements Mouse {
+
+	@Override
+	public void clickR() {
+		System.out.println("[ 무선 R ]");
+		
+	}
+
+	@Override
+	public void clickL() {
+		System.out.println("[ 무선 L ]");		
+	}
+
+	@Override
+	public void mouseCheck() {
+		System.out.println(" 무선마이스 연결 확인 ");
+		clickR();
+		clickL();		
+	}
+}

spring/di/setting.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+	<!-- Exam exam = new NewlecExam(); -->
+	<bean id ="exam" class="spring.di.entity.NewlecExam" />
+
+	<!-- ExamConsole console = new GridExamConsole(); -->	
+	<bean id ="console" class ="spring.di.ui.InlineExamConsole" >
+		<!-- console.setExam(exam); -->
+		<property name ="exam" ref="exam" />
+	</bean>
+	
+
+</beans>

spring/di/ui/Computer.java

@@ -0,0 +1,14 @@
+package spring.di.ui;
+
+import spring.di.entity.Mouse;
+
+public class Computer {
+	private Mouse mouse ;
+	
+	public void connectMouse(Mouse mouse) {
+		this.mouse=mouse;
+	};
+	public void mouseCheck() {
+		mouse.mouseCheck();
+	};
+}

spring/di/ui/ExamConsole.java

@@ -1,5 +1,8 @@
 package spring.di.ui;
 
+import spring.di.entity.Exam;
+
 public interface ExamConsole {
 	void print();
+	void setExam(Exam exam);
 }

spring/di/ui/GridExamConsole.java

@@ -5,10 +5,14 @@ import spring.di.entity.Exam;
 public class GridExamConsole implements ExamConsole {
 
 	private Exam exam;		
+
+	public GridExamConsole() {
+	}
 	
 	public GridExamConsole(Exam exam) {		
 		this.exam = exam;
 	}
+	
 	@Override
 	public void print() {
 		System.out.println("┌──────────┬──────────┐");
@@ -17,5 +21,12 @@ public class GridExamConsole implements ExamConsole {
 		 System.out.printf("│   %3d  │    %3.2f   │\n", exam.total(), exam.avg());
 		System.out.println("└──────────┴──────────┘");
 	}
+	
+	@Override
+	public void setExam(Exam exam) {
+		this.exam = exam;
+	}
+	
+	
 
 }

spring/di/ui/InlineExamConsole.java

@@ -6,6 +6,9 @@ public class InlineExamConsole implements ExamConsole {
 
 	private Exam exam;		
 	
+	public InlineExamConsole() {
+	}
+	
 	public InlineExamConsole(Exam exam) {		
 		this.exam = exam;
 	}
@@ -15,4 +18,9 @@ public class InlineExamConsole implements ExamConsole {
 		System.out.printf("total is %d, avg is %f\n", exam.total(), exam.avg());
 	}
 
+	@Override
+	public void setExam(Exam exam) {
+		this.exam=exam;
+	}
+
 }