programmer", "male", 43, 2000));
add(new Person("Elsdon", "1", "Java programmer", "female...", 23, 1500));
add(new Person("Elsdon", "Jaycob", "Java programmer", "male", 33, 1800));...", "2", "Java programmer", "female", 27, 1900));
add(new Person("Maude", "2", "Java programmer...extends K> classifier) {
return groupingBy(classifier, toList());
}
这个就是嵌套写法。...理解起来就是接收Collector类型作为参数之一,同时返回一个Collector类型,这就是嵌套调用的基础。
public static
Collector<T, ?