Java Coding Problems

The sum(), min(), and max() terminal operations

Now, let's combine the elements of this stream to express the following queries:

• How can we calculate the total weight of melons (sum())?
• What is the heaviest melon (max())?
• What is the lightest melon (min())?

In order to calculate the total weight of melons, we need to sum up all the weights. For primitive specializations of Stream (IntStream, LongStream, and so on), the Java Stream API exposes a terminal operation named sum(). As its name suggests, this method sums up the elements of the stream:

int total = melons.stream()  .mapToInt(Melon::getWeight)  .sum();

After sum(), we also have the max() and min() terminal operations. Obviously, max() returns the maximum value of the stream, while ...