java.lang.Object
  |
  +--java.lang.Throwable
        |
        +--java.lang.Exception
              |
              +--java.lang.RuntimeException
RuntimeException is the superclass of those 
 exceptions that can be thrown during the normal operation of the 
 Java Virtual Machine. 
 
 A method is not required to declare in its throws 
 clause any subclasses of RuntimeException that might 
 be thrown during the execution of the method but not caught.
| Constructor Summary | |
| RuntimeException()Constructs a RuntimeExceptionwith no detail  message. | |
| RuntimeException(String s)Constructs a RuntimeExceptionwith the specified 
 detail message. | |
| Methods inherited from class java.lang.Throwable | 
| getMessage, 
printStackTrace, 
toString | 
| Methods inherited from class java.lang.Object | 
| equals, 
getClass, 
hashCode, 
notify, 
notifyAll, 
wait, 
wait, 
wait | 
| Constructor Detail | 
public RuntimeException()
RuntimeException with no detail  message.public RuntimeException(String s)
RuntimeException with the specified 
 detail message.s - the detail message.