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Returning objects

Published on 2024-11-09
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  • A method can return any data type, including class types.

  • An example is the ErrorMsg class, which can be used to report errors.

  • The getErrorMsg() method of the ErrorMsg class returns a String object.

  • This String object contains the description of an error based on the error code received.

  • Example:
    Retornando objetos

  • You can return objects from classes you create yourself.

  • Example: reworked version of the previous program with two error classes.

  • The Err class encapsulates an error message along with a severity code.

  • The ErrorInfo class defines a method called getErrorInfo().

  • The getErrorInfo() method returns an object of class Err.

Retornando objetos

Retornando objetos

  • Every time getErrorInfo() is called, a new Err object is created and returned.

  • The Err object reference is used in main() to display the error message and severity code.

  • An object returned by a method continues to exist until it is no longer referenced.

  • When there are no more references to the object, it is the target of garbage collection.

  • The object is not destroyed just because the method that created it is terminated.

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