java面向对象-异常处理的一个例子

/*

毕老师用电脑上课

开始思考上课中出现的问题

比如问题是：

电脑蓝屏

电脑冒烟

 

 要对问题进行描述，封装成对象

 

 可是当冒烟发生后，出现讲课进度无法继续

 

 出现了讲师的问题，课时计划无法完成

*/class LanPingException extends Exception
{
LanPingException(String message)
{
super(message);
}
}

class MaoYanException extends Exception
{
MaoYanException(String message)
{
super(message);
}
}

class NoPlanException extends Exception
{
NoPlanException(String message)
{
super(message);
}
}
class Computer
{
private int state = 3;
public void run()throws LanPingException,MaoYanException
{
if(state==2)
throw new LanPingException("蓝屏了");
if(state==3)
throw new MaoYanException("冒烟了");
System.out.println("电脑运行");
}
public void reset()
{
state = 1;
System.out.println("电脑重启");
}
}
class Teacher
{
private String name;
private Computer cmpt;
Teacher(String name)
{
this.name = name;
cmpt = new Computer();
}
public void prelect()throws NoPlanException
{
try
{
cmpt.run();
}
catch(LanPingException e)
{
cmpt.reset();
}
catch(MaoYanException e)
{
test();
throw new NoPlanException("课时无法继续"+e.getMessage());
}
System.out.println("讲课");
}
public void test()
{
System.out.println("lianxi");
}
}

class ExceptionTest
{
public static void main(String[] args)
{
Teacher t = new Teacher("毕老师");
try
{
t.prelect();
}
catch(NoPlanException e)
{
System.out.println(e.toString());
System.out.println("换老师或者放假");
}
}
}