Java学习笔记——异常中的继承问题

<span style="font-size:18px;">
</span>

<span style="font-size:18px;">class AException extends Exception
{
}

class BException extends AException
{
}

class Fu
{
public void show() throws AException
{

}
}

class Zi extends Fu
{
public void show() throws BException //或者抛出 BException
{

}
}

class ExceptionDemo3

{
public static void main(String[] args)
{
try{
Fu f = new Fu();
f.show();
}catch(AException e)//只能抛出AException
{

}
try{
Zi z = new Zi();
z.show();
}catch(AException e) //当子类中方法抛出BException时这也要抛出BException
{

}

try{
Fu f = new Zi();
f.show();
}catch(AException e)//只能抛出AException,因为多态
{

}
}
}</span>