/**
    *throwException方法,在方法内捕获Exception异常
    */
    public void throwException()
    {
        try
        {
            System.out.println("抛出一个异常");
            //抛出一个Exception对象
      throw new Exception();
        }
        catch(Exception e)
        {
            System.out.println("捕获到内部异常对象");
        }
    }//throwException()
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應該定義為:
public void throwException throws Exception()