в 17:44, 31 мая 2010

2010-05-31T17:44:26Z

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2010-05-31T15:22:48Z

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== Closed Coupled ==

File: Main.java



<source lang="java">
import java.io.PrintStream;
public class Main {
public static void main(String[] a) {
MessageData source = new MessageData("Hello, world");
MessageReporter destination = new MessageReporter();
destination.write(System.out, source.getMessage());
}
}
final class MessageData {
private final String message;
public MessageData(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
}
class MessageReporter {
public void write(PrintStream out, String message) {
out.println(message);
}
}</source>



== Decouple With Interface ==

File: Main.java



<source lang="java">
public class Main {
public static void main(String[] a) {
MessageData source = new SimpleMessageData("Hello, world");
MessageReporter destination = new StdoutMessageReporter();
destination.write(source.getMessage());
}
}
interface MessageReporter {
void write(String message);
}
interface MessageData {
String getMessage();
}
class StdoutMessageReporter implements MessageReporter {
public void write(String message) {
System.out.println(message);
}
}
class SimpleMessageData implements MessageData {
private final String message;
public SimpleMessageData() {
this("Hello, world");
}
public SimpleMessageData(String message) {
this.message = message;
}
public String getMessage() {
return this.message;
}
}</source>



== Spring Style Decouple ==

File: helloworld-context.properties



<source lang="java">
source.(class)=SimpleMessageData
destination.(class)=StdoutMessageReporter</source>

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