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What is an Exceptions ?
• What is an exception? • try-catch • finally • The different kinds of exceptions • Multiple catch clauses • The throws clause • Throwing exceptions • Writing your own exception classes
What is an Exception?Consider this program: public class HelloThere {
public static void main(String[] args) { System.out.println("Hello " + args[0]); }
}Suppose it's run like this: $ java HelloThereRemember that's there's no args[0]. Here's what you get:$ java HelloTherejava.lang.ArrayIndexOutOfBoundsException: 0 at HelloThere.main(HelloThere.java:5)This is not a crash. The virtual machine exits generally. All memory is cleaned up. All resources are released.
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