java 如何自定义异常 用代码展示 真心靠谱

先建两个自定义的异常类

ChushufuException类

class ChushufuException extends Exception  {      public ChushufuException(String msg)      {          super(msg);      }  } 

ChushulingException

class ChushulingException extends Exception  {      public ChushulingException(String msg)      {          super(msg);      }  } 

好了，然后再写一个测试类Numbertest

class Numbertest   {      public int shang(int x,int y) throws ChushulingException,ChushufuException      {          if(y<0)          {              throw new ChushufuException("xxxxxxxxxxx您输入的是"+y+",规定除数不能为负数!");//抛出异常          }          if(y==0)          {              throw new ChushulingException("您输入的是"+y+",除数不能为0!");          }                int m=x/y;          return m;      }  }

是不是很简洁明了？

再来一个测试类

class Rt001  {      public static void main(String[]args) throws ChushulingException      {          Numbertest n=new Numbertest();      Logger logger = Logger.getLogger(Rt001.class.getName());        //捕获异常          try          {              System.out.println("商="+n.shang(1,-3));          }  //        catch(ChushulingException yc)  //        {  //            System.out.println(yc.getMessage());  //            yc.printStackTrace();  //        }          catch(ChushufuException yx)          {              System.out.println(yx.getMessage());              yx.printStackTrace();              logger.error("oops, got an exception: ",yx);        }  //        catch(Exception y)  //        {  //            System.out.println(y.getMessage());  //            y.printStackTrace();  //        }            //finally{ System.out.println("finally!");} ////finally不管发没发生异常都会被执行          }  }