Problem: How to create a Java List with copies of the same element? Java Collections.nCopies(n, T) does that, but has its quirks. Read on…

Problem: Having a Java Collection find min/max values? As in many cases it can easily be done with Java Collections API. See the following example…

Problem: When using legacy libraries sometimes you need to convert Java Enumeration to List to use it with modern code it comfortable way. Again Java Collections API comes to the rescue!

Problem: How to find a first/last occurrence of sublist in Java List? As expected Java Collections API has a method for this. See the example for details.

Problem: When working with legacy code, you need to convert Java Collection to Enumeration. This example shows how to do that using Java Collections API features!

Problem: In Java empty List/Collection is very often used to implement NullObject Pattern and make code more readable. See how on the following example.

Problem: Sometimes we want on Java List replace/fill all/selected elements. It can be done manually, but much better way is to reuse Java Collections API. See how!

Problem: Sometimes you have to in Java find/count occurrences of objects inside a Java Collection. It can be done manually, but vast Java Collections API provides a better way.

Problem: How to check that a collection in Java contains any of elements from some other collection? It’s very common problem when working on Sets, but also applicable to Java Lists and other collections.