假设一个 Person 类：
public class Person {
private String name;
private int amount;
}
并假设一个 Person 集合：
persons = [{"Joe", 5}, {"Joe", 8}, {"Joe", 10}, {"Jack", 3}, {"Jack",6}, {"Joe" 4},
{"Joe", 7}, {"Jack", 12}, {"Jack", 15}, {"Luke", 10}, {"Luke", 12}]
我想要的是获取具有相同名称且相互跟随的合并元素的人员列表并求和（使用java 8 Stream）；像这样的列表：
Perons = [{"Joe", 23}, {"Jack", 9}, {"Joe", 11}, {"Jack", 27}, {"Luke", 22}]