InstantiationError This error is thrown in response to an attempt to instantiate an abstract class or an interface. 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 Runtime exceptions The java.lang package defines the following standard runtime exception classes: ArithmeticException This exception is thrown to indicate an exceptional arithmetic condition, such as integer division by zero. Classical examples of (in)famous unchecked exceptions: OutOfMemoryError (extends Error); StackOverflowError (extends Error); NullPointerException (extends RuntimeException); IllegalArgumentException (extends RuntimeException); etc etc. his comment is here
Exceptions are caught by handlers positioned along the thread's method invocation stack. The need for the Gram–Schmidt process How to avoid contributors from claiming about my LGPL-released software? OutOfMemoryError This error is thrown when an attempt to allocate memory fails. This exception is also thrown when a program tries to create an instance of a class (i.e., uses the newInstance() method of the Class class) that does not have a zero-argument
Throwable serves as the base class for an entire family of classes, declared in java.lang, that your program can instantiate and throw. Exception hierarchy for coffee sippingIf the customer discovers, with dismay, that the coffee is cold, your program could throw a TooColdException. Figure 9.1: Standard Java exception classes Figure 9.2: Standard Java error classes Exceptions All of the subclasses of Exception represent exceptional conditions that a normal Java program may want to handle. On the other hand Unchecked Exception, which are subclass of RuntimeException mostly represent programming errors.
The cause is not initialized, and may subsequently be initialized by a call to Throwable.initCause(java.lang.Throwable). These conditions could be exceptions because they are (hopefully) not the normal situation in your café. (Exceptional conditions are not necessarily rare, just outside the normal flow of events.) The code Please click the link in the confirmation email to activate your subscription. Java Error Class Is Public Should Be Declared In A File null : cause.toString()) (which typically contains the class and detail message of cause).
In this case, however, you must place the catch clause for TooColdException above the one for TemperatureException, or the source file won't compile. Java Class Expected Error Also see the documentation redistribution policy. Many of the standard exceptions are also subclasses of RuntimeException. http://stackoverflow.com/questions/14196820/why-do-we-need-error-class That is, Error and its subclasses are regarded as unchecked exceptions for the purposes of compile-time checking of exceptions.