摘要:
<p>For example, to compute the set of last names of people in each city:* <pre>{@code* Map<City, Set<String>> namesByCity* = people.stream().collect(g 阅读全文
摘要:
package com.example.demo; public class Client { public static void main(String[] args) { Builder b=new ConcreteBuilder(); ConcreteBuilder b1 = new Con 阅读全文