Locates a particular type of exception : Exception « Development « Java Tutorial

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Java Tutorial » Development » Exception 
6. 23. 20. Locates a particular type of exception
// Copyright 2008 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


/**
 * Contains static methods useful for manipulating exceptions.
 */
public class ExceptionUtils
{
    /**
     * Locates a particular type of exception, working its way via the cause property of each exception in the exception
     * stack.
     *
     @param t    the outermost exception
     @param type the type of exception to search for
     @return the first exception of the given type, if found, or null
     */
    public static <T extends Throwable> T findCause(Throwable t, Class<T> type)
    {
        Throwable current = t;

        while (current != null)
        {
            if (type.isInstance(current)) return type.cast(current);

            // Not a match, work down.

            current = current.getCause();
        }

        return null;
    }
}
6. 23. Exception
6. 23. 1. Error Handling
6. 23. 2. Types of Exceptions
6. 23. 3. Java's Unchecked RuntimeException Subclasses
6. 23. 4. Java's Checked Exceptions Defined in java.lang
6. 23. 5. Throwing an Exception from a Method
6. 23. 6. Write a catch block that handles java.lang.Exception
6. 23. 7. Handling Exceptions
6. 23. 8. Multiple catch Blocks
6. 23. 9. The finally Block
6. 23. 10. Exception Objects: stack trace
6. 23. 11. Defining Your Own Exceptions, Throwing Your Own Exception
6. 23. 12. Demonstrate exception chaining.
6. 23. 13. Getting the Stack Trace of an Exception
6. 23. 14. Put printStackTrace() into a String: redirect the StackTrace to a String with a StringWriter/PrintWriter
6. 23. 15. Check whether given exception is compatible with the exceptions declared in a throws clause
6. 23. 16. Convert an exception to a String with full stack trace
6. 23. 17. Get Deepest Throwable
6. 23. 18. Get the stack trace of the supplied exception.
6. 23. 19. Is Checked Exception
6. 23. 20. Locates a particular type of exception
6. 23. 21. Make a string representation of the exception
6. 23. 22. Print all of the thread's information and stack traces
6. 23. 23. Return stack trace from the passed exception as a string
6. 23. 24. Returns the root cause of an exception
6. 23. 25. Create a new Exception, setting the cause if possible.
6. 23. 26. Returns the output of printStackTrace as a String.
6. 23. 27. This program creates a custom exception type.
6. 23. 28. Utility methods for dealing with stack traces
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