Collection Framework Examples (Java)

Overview

This repository contains small example programs that demonstrate usage of Java collection classes (primarily ArrayList and Vector). The examples are organized into two folders: Array List and Vector. Each file is a compact, self-contained Java class illustrating a specific operation or pattern.

Repository structure

• Root:

  • README.md — this documentation.
  • ListInterfaceExmp.java — example using the List interface.

• Array List/

  • Array List/ArrayListClass.java — basic ArrayList usage and examples.
  • Array List/ArrayListConverstion.java — conversions between arrays and ArrayList (note filename spelling).
  • Array List/FreqNumber.java — frequency/count of numbers in a list/array.
  • Array List/LongestSubArray.java — finds the longest subarray according to example logic in the file.
  • Array List/MaxNumber.java — finds the maximum element in a collection.
  • Array List/MergeArrayList.java — demonstrates merging two ArrayList instances.
  • Array List/RotateArrayList.java — rotates elements in an ArrayList.

• Vector/

  • Vector/CheckSize.java — checks Vector size and related operations.
  • Vector/MethodContainsAll.java — demonstrates containsAll and related methods.
  • Vector/ObjStore.java — storing objects in a Vector and iteration.
  • Vector/ParameterConsVect.java — examples of constructors / parameter use with Vector.
  • Vector/SecondMax.java — finds the second largest element in a collection.
  • Vector/SetVectValue.java — setting values by index in a Vector.
  • Vector/VectorCapacityCheck.java — demonstrates capacity behavior of Vector.

How to build and run

Requirements:

• Java JDK 8 or later installed and javac/java on your PATH.

To compile all Java files from the repository root (Windows example):

javac -d out -sourcepath . ListInterfaceExmp.java Array\ List/*.java Vector/*.java

To run a specific example (replace the class name with the one you want):

java -cp out ListInterfaceExmp

Notes and conventions

• Filenames in the Array List folder contain a space; when referencing them in commands or links, encode or quote the path (e.g., Array\ List/ArrayListClass.java).
• Some files have .bak copies in the same folders; these are backups and may contain older versions.

Contributing

• Add small, focused examples that illustrate collection operations clearly.
• Follow the existing naming pattern and include a short comment at the top of each file describing the example's intent.

License

This repository does not include a license file. If you want to apply an open-source license, add a LICENSE file at the repository root.

If you'd like, I can also:

• Add a short example README-run script to compile and run a selected example.
• Standardize filenames (remove spaces) and update imports/build instructions.

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Updated README to document the project structure and usage.