package com.github.code4craft.helloworld.behavioral.observer;
import java.io.PrintStream;
/**
* @author yihua.huang@dianping.com
*/
public class HelloWorldObserver implements Observer{
private PrintStream printer = System.out;
public void setPrinter(PrintStream printer) {
this.printer = printer;
}
@Override
public void update() {
printer.println("Hello Observer!");
}
}