java observer

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package kan.hui;import java.util.Observable;import java.util.Observer;public class Subject extends Observable{/** * @param args */public static void main(String[] args) {Subject sbj = new Subject();OneObserver one = new  OneObserver();TwoObserver two = new TwoObserver();sbj.addObserver(one);sbj.addObserver(two);for (int i = 0 ;i<10;i++){sbj.setChanged();sbj.notifyObservers("监控异常出现！"+ i);}}static  public class OneObserver implements Observer{@Overridepublic void update(Observable o, Object arg) {System.out.println("OneObserver捕获异常"+ (String)arg);}}static  public class TwoObserver implements Observer{@Overridepublic void update(Observable o, Object arg) {System.out.println("TwoObserver捕获异常"+ (String)arg);}}}

结果;

TwoObserver捕获异常监控异常出现！0OneObserver捕获异常监控异常出现！0TwoObserver捕获异常监控异常出现！1OneObserver捕获异常监控异常出现！1TwoObserver捕获异常监控异常出现！2OneObserver捕获异常监控异常出现！2TwoObserver捕获异常监控异常出现！3OneObserver捕获异常监控异常出现！3TwoObserver捕获异常监控异常出现！4OneObserver捕获异常监控异常出现！4TwoObserver捕获异常监控异常出现！5OneObserver捕获异常监控异常出现！5TwoObserver捕获异常监控异常出现！6OneObserver捕获异常监控异常出现！6TwoObserver捕获异常监控异常出现！7OneObserver捕获异常监控异常出现！7TwoObserver捕获异常监控异常出现！8OneObserver捕获异常监控异常出现！8TwoObserver捕获异常监控异常出现！9OneObserver捕获异常监控异常出现！9