A training course on Java Collections typically covers the following topics:

• Overview of the Collections Framework: An introduction to the collections framework, its history, and its features.
• Collections Interfaces: This section covers the main interfaces in the collections framework, such as List, Set, Map, and Collection.
• Collections Classes: This section covers the main classes in the collections framework, such as ArrayList, LinkedList, HashSet, TreeSet, HashMap, and TreeMap.
• Algorithms and Utility Classes: This section covers the algorithms and utility classes provided by the collections framework, such as sort, search, and shuffle.
• Custom Collections: This section covers how to create custom collections, including custom implementations of the List, Set, and Map interfaces.
• Performance Considerations: This section covers the performance considerations of using different collections, including the use of generics, the impact of resizing arrays, and the trade-offs between different implementations.
• Best Practices: This section covers best practices for using collections, including tips for avoiding common pitfalls and making effective use of the framework.