class Teacher{  private Computer cmp;  public void shangKe()throws NoPlanException      /*聲明異常*/  {    cmp=new Computer();    try    {      cmp.run();    }    catch(LanPingException e)               /*電腦捕獲處理藍(lán)屏的異常*/                       {      cmp.recst();    }    catch(MaoYanException e)                /*電腦捕獲處理電腦冒煙的異常*/    {      throw new NoPlanException("上課無法繼續(xù),因?yàn)?+e.getMessage());    /*電腦無法處理這個(gè)異常，繼續(xù)把這個(gè)異常拋給老師來處理*/       }        System.out.println("老師上課");                /*沒有異常，老師就正常上課*/  }}class LanPingException extends Exception               /*自定義藍(lán)屏異常*/{  LanPingException(String m)  {    super(m);  }}class MaoYanException extends Exception             /*自定義電腦冒煙異常*/{  MaoYanException(String m)  {    super(m);  }}class NoPlanException extends Exception             /*自定義老師處理異常*/{  NoPlanException(String m)  {    super(m);  }}class Computer{  private int state=3;           /*不同的異常狀態(tài)選擇*/    public void run()throws LanPingException,MaoYanException  {    if(state==2)                         {      throw new LanPingException("電腦藍(lán)屏了");        /*符合條件就拋出異常對(duì)象*/    }    if(state==3)    {      throw new MaoYanException("電腦冒煙了");    }    System.out.println("電腦運(yùn)行");  }      public void recst()  {    System.out.println("電腦重啟");  }}class ExceptionText{  public static void main(String args[])  {    Teacher t=new Teacher();    try    {      t.shangKe();    }    catch(NoPlanException e)               /*老師捕獲處理電腦冒煙異常*/       {      System.out.println(e.toString());    }      }}