List操作:
循环:
list.forEach((p) -> System.out.printf("%s %s; %n", p.getFirstName(), p.getLastName()));
排序:
System.out.println("根据 name 排序,并显示前5个"); List<Person> sortedJavaProgrammers = javaProgrammers .stream() .sorted((p, p2) -> (p.getFirstName().compareTo(p2.getFirstName()))) .limit(5) .collect(toList());
过滤:
list.stream() .filter((p) -> (p.getSalary() > 1400)) .forEach((p) -> System.out.printf("%s %s; ", p.getFirstName(), p.getLastName()));
将列表中的元素的某一个属性拼接成字符串,或放入一个数组:
String phpDevelopers = phpProgrammers .stream() .map(Person::getFirstName) .collect(joining(" , ")); // System.out.println("将 Java programmers 的 first name 存放到 Set:"); Set<String> javaDevFirstName = javaProgrammers .stream() .map(Person::getFirstName) .collect(toSet()); List<String> javaDevFirstName = javaProgrammers .stream() .map(Person::getFirstName) .collect(toList());