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 following list of Melon wrapped in a stream:

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

Let's work on the Melon class using the sum(), min(), and max() terminal operations.