入门
public class Time01 {
public static void main(String[] args) {
// Timer timer01=new Timer();
// timer01.schedule(new TimerTask(){
//
// @Override
// public void run() {
//
// System.out.println("bombing");
// }}, 1000);
new Timer().schedule(new TimerTask() {
@Override
public void run() {
System.out.println("bombing");
}
}, 10000);
while (true) {
System.out.println(new Date().getSeconds());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
运行结果
21
22
23
24
25
26
27
28
29
30
bombing
31
32
33
连续执行
public class Time02 {
public static void main(String[] args) {
new Timer().schedule(new TimerTask() {
@Override
public void run() {
System.out.println("bombing");
}
}, 10000,3000); //每隔3秒执行
while (true) {
System.out.println(new Date().getSeconds());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
运行结果:
50
51
52
53
54
55
56
57
58
59
bombing
0
1
2
bombing
3
4
5
bombing
6
7
提高
匿名内部类是临时的
整数分为奇数和偶数,所以可以按照奇偶操作完成
/**
*一个2秒执行,另一个4秒执行,交替循环往复
*
*/
public class Time03 {
static int i = 0; // 静态变量可以记录类创建的对象数量
public static void main(String[] args) {
class MyTimerTask extends TimerTask {
//内部类内部不能生成静态变量
public void run() {
i=(i+1)%2;
System.out.println("bombing");
new Timer().schedule(new MyTimerTask(), 2000+2000*i);
}
}
new Timer().schedule(new MyTimerTask(), 2000);
while (true) {
try {
System.out.println(new Date().getSeconds());
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
运行结果:
13
14
bombing
15
16
17
18
bombing
19
20
bombing
21
22
23
24
bombing
25
/**
* 每天在指定的时间执行操作
* 提供调度需求的开源框架Quartz在这方面处理能力很强
*/
public class Timer04 {
public static void main(String[] args) {
String str = "2011-08-28 08:39:00";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Timer timer = new Timer();
try {
timer.schedule(new TimerTask() {
@Override
public void run() {
System.out.println("timer");
}
}, sdf.parse(str), 24 * 60 * 1000);
} catch (ParseException e) {
e.printStackTrace();
}
while (true) {
System.out.println(new Date().getSeconds());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
* 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
* 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 timer 0 1 2 3 4 5
*/
}