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Exception handling routine for ExceptionType1 (optional) Here is the basic form of an exception handling block. Java exception handling is managed via five key words : try, catch, throw, throws, and finally.
#Exception in java code
That method may choose to catch the exception and then can guard against premature exit or may have a block of code execute. During the execution of a program, when an exceptional condition arises, an object of the respective exception class is created and thrown in the method which caused the exception. Java's exception handling brings Run Time Error Management into the object oriented world. InstantiationException VirtualMachineError StringIndexOutofBoundException OutofMemoryError IndexOutofBoundException InstantiationError IlegalArgumentException IncompatibleClassChangeError
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RuntimeException sub classes : Error sub classes :ĪrithmeticException ClassCirculatoryErrorĪrrayIndexOutofBoundException ClassFormatError A list of exceptions that a programmer can catch in the program is summarized below : These exceptions are typically created automatically during the run time in response to some execution error. A further refinement is there by a sub class of Exception, which is for exceptional condition that created by the run time called RuntimeException. These class is responsible for giving errors in some catastrophic failures. The other branch of the throwable tree is the class Error, which defines the conditions that should not be expected to be caught under normal circumstances. The class Exception is used for exceptional conditions that user programs can catch. Two immediate subclasses of Throwable are Exception, and Error. Here, the class Throwable is used to represent all exceptional conditions.
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To handle the common possible exceptions ,Java defined a class hierarchy as shown below :įigure 5.1 :Exception Class hierarchy in Java Java programmer are released from this overhead by the exception handling mechanism in Java.īuilt-in classes for exceptions handling in Java this exception handling is an overhead of the programmer to make the program robust by including lot of if statement and error-handler routine which make the programs more complicated. In traditional programming languages like C, Pascal etc. If these exceptions are not prevented or at least handled properly, either the program will be aborted abnormally, or the incorrect result will be carried on. An exception is an abnormal condition that can occur during the execution time of a program. This Chapter discusses exceptions handling mechanism in Java. Chapter 5 - Exception Handling in Java Chapter 5 Exception Handling in Javaīuilt-in classes for exceptions handling in Java