After knowing Rules of "Access Specifiers in Method Overriding", let us find the "Rules of Exceptions in Method Overriding". The rule says "Subclass overridden method cannot throw more checked exceptions than that of super class method". Let us explain the rule through a program for clear and easy understanding. The following program does not compile …
Generally, programmer writes try in combination with catch. Using finally block is optional. But it is possible to have try with finally without catch block) and compiler accepts clearly. Observe the following code. public class Demo { public static void main(String args[]) { try { System.out.println(10/0); } finally { System.out.println(); System.out.println(“From finally block”); } System.out.println(“Hello …
Certain methods cannot be executed by the JVM alone. JVM takes the help of the underlying operating system to do the job. Such methods are known as native methods. For example, for all the file operations and thread operations, the JVM should communicate with the operating system and with the operating system cooperation, the task …
Catch block is meant to give a message to the user when an exception occurs during the execution of a program. There are different styles used by the programmer where each style gives different messages. Programmer can choose one on his needs. Few. styles are using getMessage() printStackTrace() 1st Style Following is the general style …
A few methods in Java API cannot be executed by the JVM alone. JVM takes the help of the underlying operating system to do the job. Such methods are known as native methods. For example, for all the file operations and thread operations, the JVM should communicate with the operating system (where the Java program …
IndexOutOfBoundsException Summary: In this tutorial, you learn handling of IndexOutOfBoundsException with its subclasses. IndexOutOfBoundsException is an unchecked exception that extends RuntimeException. This is used by the JVM to check the index number entered by the user is within the range of an array or string. Full hierarchy of exceptions is available at "Hierarchy of Exceptions …
Hierarchy of Exceptions (Checked Unchecked Exceptions) After knowing exceptions and exception handling mechanism, let us explore how many exceptions exist, are they inheriting from a common super class, any classification exists or not etc. Whenever you come across a new Java class, it is essential to know its super classes, so that, you can use …
Hierarchy Exceptions Checked Unchecked Exceptions Read More »
Exception Handling try catch Summary: "Exception Handling try catch" shows the importance of handling exceptions in Java. Let us write one example of code, to see the weakness and robustness of exception handling. 1. Exception Unhandled The following program explains the drawback of not handling the exception. public class ExceptionNotBothered { public static void main(String …
Runtime Error Groups Exception causes Summary: In this "Runtime Error Groups Exception causes" tutorial, you will come to know the classification of excetpions and causes in detail. Runtime Error – Groups We know earlier, the runtime errors cause the unwarranted termination of the execution of a smooth running process. The runtime errors can be broadly …
Exception handling makes a language robust. This Exceptions Tutorial for Beginners explains concepts in Simple terms Examples Screenshots. Go on reading. The programmer faces two types of problems in coding – problems arising at compile-time and problems arising at runtime. Regarding compile-time problems or mistakes the compiler takes care of and ultimately does not compile …
Throws Exception – throws Keyword The designer of a class knows very well, the problems that may occur while using the methods or constructors of the class, he designed. If the methods are used by another programmer, the question is how the designer informs the programmer, the possible problems that may occur while using the …
try catch finally – The finally Block We know earlier, there should be a successful handler in the catch block like ArithmeticException for division by zero and ArrayIndexOutOfBoundsException for wrong array index number etc. Placing a wrong handler is equivalent to not having a try-catch block at all. There may be some statements which must …
Java permits the creation of user defined exceptions as per the needs of coding. To use it Developer uses throw keyword. Explained in simple terms, examples and screenshots to Beginner in this tutorial "throw keyword User defined Exception". Using throw Keyword To display a message, a number of ways exist in Java (in C, it …
