自定义异常

1.继承现有的异常结构，RuntimeException，Exception

2.提供全局常量：serialVersionUID

3.提供重载的构造器

 

自定义异常类

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public class MyException extends Exception{     static final long serialVersionUID = -3387512393124229948L;       public MyException(){         super();     }       public MyException(String msg){         super(msg);     }   }

　　

测试类

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public class ExceptionTest {       public static void main(String[] args) {         try {             method(-10);         } catch (MyException e) {             e.printStackTrace();//MyException: 负数异常         }     }         public static void method(int num) throws MyException{         if(num>0){             System.out.println(num);         }else{             throw new MyException("负数异常");         }     } }