What does this class do in Java?

What does this class do in Java? What is an exception in Java?
package org.muos.management.managementSupport;

/**
 *      The wrapper exeption which wrap the underline exceptions.
 *
 */
public class ManagementSupportException extends Exception {
      private String message;

      public ManagementSupportException(String message) {
            this.message = message;
      }
}
yankeebushsoftwareAsked:
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mnrzCommented:
it does nothing, it is just an Exception and can be thrown by code like this:

throw new ManagementSupportException();
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mnrzCommented:
Although you may use "throw new Exception()" but this is much clear and better to categorize your exceptions
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yankeebushsoftwareAuthor Commented:
What's an exception?
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JaaxArchitectCommented:
This class serves as your application specific exception extended from the java's Exception class
By using a customized exception class for your application, you can add more features to the class whilst benefitting from those already present in the exception class. This reduces coding and maintainability - the benefits of inheritance.
It is like buying a new car and modifying it to a certain extent to suit your taste and style while maintaing the engine and transimission in tact.

The Exception class serves to indicate any abnormality the program encounters during the course of its execution. By throwing an exception the cause and nature of the problem is reported to the calling methods. It helps to diagnose the problem. Different kinds of exception  can point to different kinds of exceptional conditions or abnormalities.
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mnrzCommented:
consider this code:

int i = 0;
int j = 10;

j = j / i; //(1)

(1) this line throws an exception (error) because no number can divided into 0.

the thrown exception has a message like "Divide by Zero"

so you can catch this error by a try/catch block and display the message of error:

try{
    j = j / i;
}catch(Exception x){
    System.out.println(x.getMessage());
}

but you can define a new exception , say, DivideByZeroException like the code you mentioned

now:

try{
    j = j / i;
}catch(DivideByZeroException x){
    System.out.println(x.getMessage());
}


this is much better than former code because any programmer by a quick look at the code will understand what error might happen during this code.
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zzynxSoftware engineerCommented:
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zzynxSoftware engineerCommented:
Thanx 4 axxepting
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