Spring in action 02 -- 装配 Bean（JavaConfig）遇到的问题

package com.stanxu.javaconfig;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class CDPlayerConfigJava {

@Bean
public CompactDiscJava sgtPeppersJava(){
return new SgtPeppersJava();
}

@Bean
public MediaPlayerJava cdPlayerJava(){
return new CDPlayerJava(sgtPeppersJava());
}
}

package com.stanxu.javaconfig;

public class CDPlayerJava implements MediaPlayerJava {

private CompactDiscJava cd;

public CDPlayerJava(CompactDiscJava cd) {
// TODO Auto-generated constructor stub
this.cd = cd;
}

public void play(){
cd.play();
}

}

package com.stanxu.javaconfig;

public interface CompactDiscJava {
void play();
}

package com.stanxu.javaconfig;

public interface MediaPlayerJava {
void play();
}

package com.stanxu.javaconfig;

public class SgtPeppersJava implements CompactDiscJava {

private String title = "Sgt. Pepper's Lonely Hearts Club Band";
private String artist = "The Beatles";

public void play() {
// TODO Auto-generated method stub
System.out.print("Playing " + title + " by " + artist);
}

}

package com.stanxu.javaconfig;

import org.junit.Rule;
import org.junit.Test;

import static org.junit.Assert.*;

import org.junit.contrib.java.lang.system.StandardOutputStreamLog;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes=CDPlayerConfigJava.class)
public class CDPlayerJavaTest {

@Rule
public final StandardOutputStreamLog log = new StandardOutputStreamLog();

private CDPlayerJava player;

private CompactDiscJava disc;

@Test
public void cdShouldNotBeNull(){
assertNotNull(disc);
}

@Test
public void play(){
player.play();
assertEquals("Playing Sgt. Pepper's Lonely Hearts Club Band by The Beatles", log.getLog());
}
}