(七)GUI和AWT事件模型(2)

AWT事件模型

Coding:

class Time { //

private List lt = new ArrayList();//

private int year; //

public int getYear() { return year; }

public void addTimeListener(TimeListener t) {

lt.add(t);

}

public void removeTimeListener(TimeListener t) {

lt.remove(t);

}

public void action() {

TimeEvent event = new TimeEvent(this);

for(int i=2006;i<=3000;i++) {

this.year = i; //

Iterator it = lt.iterator();

while(it.hasNext()) {

TimeListener tl = (TimeListener)it.next();

// disp()

tl.disp(event);

}

}

}

}

//

class TimeEvent extends EventObject {

public TimeEvent(Object o) {

super(o);

}

}

//

interface TimeListener extends EventListener {

void disp(TimeEvent event);

}

// 1

class Olympics implements TimeListener {

public void disp(TimeEvent event) {

Time t = (Time)event.getSource();

if(t.getYear() % 4 == 0 ){

System.out.println(t.getYear()+” ”);

}

}

}

// 2

AWT事件模型

class WorldCup implements TimeListener {

public void disp(TimeEvent event) {

Time t = (Time)event.getSource();

if(t.getYear() % 4 == 2 ) {

System.out.println(t.getYear()+” ”);

}

}

}

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(Steven Ye)mailto: leton.ye@