In Java, exception handling is a mechanism for dealing with errors and other exceptional events that occur during program execution. When an exceptional event occurs, an object representing the event, known as an exception object, is created and thrown.

To handle exceptions in Java, you need to use a try-catch block. The try block contains the code that might throw an exception, while the catch block contains the code that handles the exception. The general syntax of a try-catch block is as follows:

try {
    // code that might throw an exception
} catch (ExceptionType1 ex1) {
    // code to handle exception of type ExceptionType1
} catch (ExceptionType2 ex2) {
    // code to handle exception of type ExceptionType2
} finally {
    // code to execute whether an exception was thrown or not
}

The catch block can catch exceptions of different types by using multiple catch blocks. If an exception is thrown in the try block, the catch block with the matching exception type will be executed. If none of the catch blocks match the exception type, the exception is propagated up the call stack.

The finally block is optional and is used to specify code that should be executed regardless of whether an exception was thrown or not. For example, you might use the finally block to close resources such as files or network connections.

In addition to the try-catch block, Java provides a few other constructs for working with exceptions, including the throw statement, which allows you to manually throw an exception, and the throws clause, which is used to declare that a method may throw an exception.