What is variable shadowing used for in a Java class?

by

The basic purpose of shadowing is to decouple the local code from the surrounding class. If it wasn’t available, then consider the following case.

A Class Foo in an API is released. In your code you subclass it, and in your subclass use a variable called bar. Then Foo releases an update and adds a protected variable called Bar to its class.

Now your class won’t run because of a conflict you could not anticipate.

However, don’t do this on purpose. Only let this happen when you really don’t care about what is happening outside the scope.

More Related Contents:

  1. Why is it not possible to shadow a local variable in a loop?
  2. What is a shell script, makefile and ant file [closed]
  3. Why an instance of class MqttClient must be enclosed by try/catch?
  4. Why my program crash when i press back Button
  5. Java Class that implements Map and keeps insertion order?
  6. How to make a JAR file that includes DLL files?
  7. Compiled vs. Interpreted Languages
  8. What does the arrow operator, ‘->’, do in Java?
  9. Appending files to a zip file with Java
  10. How to return 2 values from a Java method?
  11. How and where are Annotations used in Java?
  12. private final static attribute vs private final attribute
  13. Is it good practice to make the constructor throw an exception? [duplicate]
  14. Gson and deserializing an array of objects with arrays in it
  15. Printing a large Swing component
  16. Tomcat Guice/JDBC Memory Leak
  17. Parsing XML with XPath in Java [duplicate]
  18. How can I share a variable or object between two or more Servlets?
  19. Java/Swing: Obtain Window/JFrame from inside a JPanel
  20. Java volatile array?
  21. Start CMD by using ProcessBuilder
  22. Why does Java not see the updated value from another thread?
  23. Use Java and RegEx to convert casing in a string
  24. How to list all AWS S3 objects in a bucket using Java
  25. What are bytecodes and how does the JVM handle them
  26. Difference between String trim() and strip() methods in Java 11
  27. How do you know a variable type in java? [duplicate]
  28. Running a method when closing the program?
  29. Compiling and running with JavaFX 2.1
  30. Prompt Android App User to Update App if current version market version

Leave a Comment