Java Exception class

Exception class Hierarchy

The exception class hierarchy starts with the java.lang.Throwable class. When an exception is thrown, it must be the Throwable object of the class or any of its subclasses.

catchThe parameters of a block must be of Throwable type or its subclasses, for example: Exception , ArithmeticException , and IOException so on.

You can create your own defined exception class by inheriting an exception class class.

Organization arranges multiple catch blocks

The Java runtime selects the appropriate catch blocks and looks for the appropriate blocks from the first block in the order they are catch started catch .
tryMultiple blocks of a block catch must be arranged from the most specific exception type to the most common exception type.

The following code uses catch a valid sequence of multiple blocks.

ArithmeticExceptionA class is a RuntimeException subclass of a class.

If both exceptions are try handled in blocks of the same catch block, then the most specific type, that is ArithmeticException , must precede the most common type, before the RuntimeException exception class.

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Java Exception class