public class Error extends Throwable
Error is a subclass of Throwable
 that indicates serious problems that a reasonable application
 should not try to catch. Most such errors are abnormal conditions.
 The ThreadDeath error, though a "normal" condition,
 is also a subclass of Error because most applications
 should not try to catch it.
 
 A method is not required to declare in its throws
 clause any subclasses of Error that might be thrown
 during the execution of the method but not caught, since these
 errors are abnormal conditions that should never occur.
 That is, Error and its subclasses are regarded as unchecked
 exceptions for the purposes of compile-time checking of exceptions.
ThreadDeath, 
Serialized Form| Modifier | Constructor and Description | 
|---|---|
|   | Error()Constructs a new error with  nullas its detail message. | 
|   | Error(String message)Constructs a new error with the specified detail message. | 
|   | Error(String message,
     Throwable cause)Constructs a new error with the specified detail message and
 cause. | 
| protected  | Error(String message,
     Throwable cause,
     boolean enableSuppression,
     boolean writableStackTrace)Constructs a new error with the specified detail message,
 cause, suppression enabled or disabled, and writable stack
 trace enabled or disabled. | 
|   | Error(Throwable cause)Constructs a new error with the specified cause and a detail
 message of  (cause==null ? null : cause.toString())(which
 typically contains the class and detail message ofcause). | 
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toStringpublic Error()
null as its detail message.
 The cause is not initialized, and may subsequently be initialized by a
 call to Throwable.initCause(java.lang.Throwable).public Error(String message)
Throwable.initCause(java.lang.Throwable).message - the detail message. The detail message is saved for
          later retrieval by the Throwable.getMessage() method.public Error(String message, Throwable cause)
Note that the detail message associated with
 cause is not automatically incorporated in
 this error's detail message.
message - the detail message (which is saved for later retrieval
         by the Throwable.getMessage() method).cause - the cause (which is saved for later retrieval by the
         Throwable.getCause() method).  (A null value is
         permitted, and indicates that the cause is nonexistent or
         unknown.)public Error(Throwable cause)
(cause==null ? null : cause.toString()) (which
 typically contains the class and detail message of cause).
 This constructor is useful for errors that are little more than
 wrappers for other throwables.cause - the cause (which is saved for later retrieval by the
         Throwable.getCause() method).  (A null value is
         permitted, and indicates that the cause is nonexistent or
         unknown.)protected Error(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace)
message - the detail message.cause - the cause.  (A null value is permitted,
 and indicates that the cause is nonexistent or unknown.)enableSuppression - whether or not suppression is enabled
                          or disabledwritableStackTrace - whether or not the stack trace should
                           be writable Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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