java自定义异常

package com.test;
/** 
 * @author QiaoJiafei 
 * @version 创建时间：2016年1月6日 下午2:58:41 
 * 类说明 
 */
public class TestException {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Teacher t = new Teacher("乔佳飞");
        try {
            t.jk();
        } catch (NoPlanException e) {
            System.out.println(e.toString()+"..............");
            // TODO Auto-generated catch block
            System.out.println("我知道了");
        }
    }

}

class Teacher {
    String name;
    Computor cp;
    public Teacher(String name) {
        // TODO Auto-generated constructor stub
        this.name = name;
        cp = new Computor();
    }
    
    void jk() throws NoPlanException {
        try {
            cp.run();
            System.out.println(name+"开始讲课");
        } catch (MaoYanException e) {
            // TODO Auto-generated catch block
            System.out.println(e.toString());
            test();
            throw  new NoPlanException("停止讲课，原因是："+e.toString());
        } catch (LanPingException e) {
            // TODO Auto-generated catch block
            System.out.println(e.toString());
            cp.reset();
            cp.state = 0;
            jk();
        }
    }
    
    void test() {
        System.out.println("大家联系");
    }
    
}

class Computor {
    int state = 2;
    void run() throws MaoYanException, LanPingException {
        
        if(state == 1)
            throw new LanPingException("电脑蓝屏了");
        if(state == 2)
            throw new MaoYanException("电脑冒烟了");
        System.out.println("电脑开始运行");
    }
    
    void reset() {
        System.out.println("电脑重启");
    }
}

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

class LanPingException extends Exception {
    LanPingException(String msg) {
        super(msg);
    }
}

class NoPlanException extends Exception {
    NoPlanException(String msg) {
        super(msg);
    }
}