分类: Java
2010-03-26 14:24:52
void addObserver(Observer o) |
setChanged();
notifyObservers(); |
void update(Observable o, Object arg) |
package com.zj.observer;
import java.util.Observable;
public class NumObservable extends Observable {
private int data = 0;
public int getData() {
return data;
}
public void setData(int i) {
data = i;
setChanged();
notifyObservers();
}
} |
package com.zj.observer;
import java.util.Observable;
import java.util.Observer;
public class NumObserver implements Observer{
public void update(Observable o, Object arg) {
NumObservable myObserable=(NumObservable) o;
System.out.println("Data has changed to " +myObserable.getData());
}
} |
package com.zj.observer;
public class SingleTest {
public static void main(String[] args) {
NumObservable number = new NumObservable();
number.addObserver(new NumObserver());
number.setData(1);
number.setData(2);
number.setData(3);
}
} |
package com.zj.observers;
import java.util.Observable;
public class NumsObservable extends Observable {
public final static Integer ODD = 1;
public final static Integer EVEN = 2;
private int data = 0;
public int getData() {
return data;
}
public void setData(int i) {
data = i;
Integer flag = EVEN;
if ((data & 0x0001) == 1)
flag = ODD;
setChanged();
notifyObservers(flag);
}
} |
package com.zj.observers;
import java.util.Observable;
import java.util.Observer;
public class OddObserver implements Observer {
public void update(Observable o, Object arg) {
if (arg == NumsObservable.ODD) {
NumsObservable myObserable = (NumsObservable) o;
System.out.println("OddObserver:Data has changed to " + myObserable.getData());
}
}
} |
package com.zj.observers;
import java.util.Observable;
import java.util.Observer;
public class EvenObserver implements Observer {
public void update(Observable o, Object arg) {
if (arg == NumsObservable.EVEN) {
NumsObservable myObserable = (NumsObservable) o;
System.out.println("EvenObserver:Data has changed to " + myObserable.getData());
}
}
} |
package com.zj.observers;
public class MultiTest {
public static void main(String[] args) {
NumsObservable number = new NumsObservable();
number.addObserver(new OddObserver());
number.addObserver(new EvenObserver());
number.setData(1);
number.setData(2);
number.setData(3);
}
} |
本文出自 “子 孑” 博客,请务必保留此出处http://zhangjunhd.blog.51cto.com/113473/68949