List<实体类>根据多个字段去重

现在有一个实体类Person,属性有三个,分别是name,age,address,根据这三个属性将list<Person>中三个字段都相同的数据进行去重。

//创建list,添加数据
        List<Person> list = new ArrayList<>();
        list.add(new Person("Tom", 15, "America"));
        list.add(new Person("Tam", 16, "China"));
        list.add(new Person("Tom", 15, "Japan"));
        list.add(new Person("Tcm", 18, "Russia"));
        list.add(new Person("Tom", 15, "America"));
        list.add(new Person("Tdm", 16, "America"));
        list.add(new Person("Tem", 17, "America"));

// 根据三个字段去重
        List<Person> lst = list.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(
                () -> new TreeSet<>(Comparator.comparing(o -> o.getName() + "#" + o.getAge() + "#" + o.getAddress()))),
                ArrayList::new));

// 遍历输出一下
        lst.forEach(person -> System.out.println(person.toString()));

//结果:

Person [name=Tam, age=16, address=China]
Person [name=Tcm, age=18, address=Russia]
Person [name=Tdm, age=16, address=America]
Person [name=Tem, age=17, address=America]
Person [name=Tom, age=15, address=America]
Person [name=Tom, age=15, address=Japan]

原文地址:https://www.cnblogs.com/xlj227/p/13626154.html