Timer 实例化多个对象就会启动多个线程
TimerTask 中 捕获异常为基类Exception，那么出现异常后就继续执行.及时报错
TimerTask中未捕获异常或者捕获异常与程序抛出异常不一致，都会导致当前线程停止。
TaskTEST1.java ：不捕获异常
package TaskTestPackage;
import java.util.TimerTask;
public class TaskTEST1 extends TimerTask{
boolean bool=true;
int i=;
@Override
public void run() throws ArrayIndexOutOfBoundsException{
i=i+;
if (i>) {
throw new RuntimeException();
}else {
System.out.println(i);
}
}
}
TaskTEST2.java
package TaskTestPackage;
import java.util.TimerTask;
public class TaskTEST2 extends TimerTask{
int a=;
@Override
public void run() {
// TODO Auto-generated method stub
a=a-;
System.out.println(a);
}
}
ETL.java
package TaskTestPackage;
import java.util.Date;
import java.util.Timer;
public class ETL {
public static void main(String[] args) {
Timer timer=new Timer();
timer.schedule(new TaskTEST1(), new Date(), );
Timer timer1=new Timer();
timer1.schedule(new TaskTEST2(), new Date(), );
}
}
执行结果：
修改TaskTEST1.java：捕获异常为Exception 基类
package TaskTestPackage;
import java.util.TimerTask;
public class TaskTEST1 extends TimerTask{
boolean bool=true;
int i=;
@Override
public void run() throws ArrayIndexOutOfBoundsException{
try {
i=i+;
if (i>) {
throw new RuntimeException();
}else {
System.out.println(i);
}
}catch(Exception ex){
System.out.println(ex);
}
}
}
执行结果如下
修改TaskTEST1.java：捕获异常与抛出异常不一致
package TaskTestPackage;
import java.util.TimerTask;
public class TaskTEST1 extends TimerTask{
boolean bool=true;
int i=;
@Override
public void run() throws ArrayIndexOutOfBoundsException{
try {
i=i+;
if (i>) {
throw new RuntimeException();
}else {
System.out.println(i);
}
}catch(ArrayIndexOutOfBoundsException ex){
System.out.println(ex);
}
}
}
执行结果：