Exception Handling Keywords In Java

Try to understand the difference between throws and throw keywords throws is used to postpone the handling of a checked exception and throw is used to invoke an exception explicitly.

Exception handling keywords in java. Exception handling in java is a powerful mechanism that is used to handle the runtime errors compile time errors are not handled by exception handling in java. If an exception occurs in your code suppose in line 6 then the rest of the code is not executed. This diagram summaries usage of these keywords. System generated exceptions are automatically thrown by the java run time system.

Generally throw keyword is used to throw user defined exception or custom exception. Exception handling is one of the most important feature of java programming that allows us to handle the runtime errors caused by exceptions. There are five keywords used in java for exception handling. Finally the try block the try block contains the code that might throw an exception.

The classes which directly inherit throwable class except runtimeexception and error are known as checked exceptions e g. Any exception that is thrown out of a method must be specified as such by a throws clause. Let s list five exception handling keywords and we will discuss each keyword with an example. The catch block a catch block must be declared after try block.

The try block contains at least one catch block or finally block. Java exception handling keywords there are 5 keywords used in java exception handling. You can throw an exception either a newly instantiated one or an exception that you just caught by using the throw keyword. Throw we know that if any exception occurs an exception object is getting created and then java runtime starts processing to handle them.

Let s to understand the basic syntax of try catch throw throws and finally keywords. Java provides specific keywords for exception handling purposes we will look after them first and then we will write a simple program showing how to use them for exception handling. Although it is perfectly valid to throw pre defined exception or already defined exception in java like ioexception nullpointerexception arithmeticexception interruptedexcepting arrayindexoutofboundsexception etc. Exception handling in java.

Throw we know that if any exception occurs an exception object is getting created and then java runtime starts processing to handle them. Java exception handling is managed via five keywords in this article we will use all these five keywords with examples.