Java Coding Problems

186. Collecting the result of a stream

Let's assume that we have the following Melon class:

public class Melon {  private String type;  private int weight;  // constructors, getters, setters, equals(),  // hashCode(), toString() omitted for brevity}

Let's also assume that we have the List of Melon:

List<Melon> melons = Arrays.asList(new Melon("Crenshaw", 2000),  new Melon("Hemi", 1600), new Melon("Gac", 3000),  new Melon("Apollo", 2000), new Melon("Horned", 1700),  new Melon("Gac", 3000), new Melon("Cantaloupe", 2600));

Typically, a stream pipeline ends up with a summary of the elements in the stream. In other words, we need to collect the results in a data structure such as List, Set, or Map (and their companions).

For accomplishing this task, ...