Primitives.java

package com.insightfullogic.java8.examples.chapter4;

import com.insightfullogic.java8.examples.chapter1.Album;

import java.util.IntSummaryStatistics;

public class Primitives {

// BEGIN printTrackLengthStatistics
public static void printTrackLengthStatistics(Album album) {
    IntSummaryStatistics trackLengthStats
            = album.getTracks()
                   .mapToInt(track -> track.getLength())
                   .summaryStatistics();

    System.out.printf("Max: %d, Min: %d, Ave: %f, Sum: %d",
                      trackLengthStats.getMax(),
                      trackLengthStats.getMin(),
                      trackLengthStats.getAverage(),
                      trackLengthStats.getSum());
}
// END printTrackLengthStatistics

}