如何在流API中使用system.out重写递增循环

Question

如何在Java 8流API中重写此代码？

public static void main(String[] args) {
    final List<String> ids = Arrays.asList("001", "007", "012", "099", "101", "167");
    int total = 0;
    for (String id : ids) {
        if (id.indexOf("1") >= 0) {
            System.out.println(id);
            total++;
        }
    }
    System.out.println("Total count: " + total);
}

Answer 1

我们可以这样做：

    System.out.println(
            "Total count: " + ids.stream()
                                .filter(id -> id.indexOf("1") >= 0)
                                .peek(System.out::println)
                                 .count());

Answer 2

等效流可以这样

long total = ids.stream()
     .filter(id - > id.indexOf("1") >= 0)
     .peek(System.out::println)
     .count();