小编Gag*_*ngh的帖子

class Employee {

    public String name;
    public Integer age;
    public Employee(String n, int age) {
        this.name = n;
        this.age = age;
    }
    public String toString() {
        return this.name+":"+this.age;
    }
}

内部主要：

ArrayList<Employee> list = new ArrayList<>();
list.add(new Employee("NameA", 10));
list.add(new Employee("NameB", 25));
list.add(new Employee("NameC", 30));
list.add(new Employee("NameD", 45));
list.add(new Employee("NameE", 50));

System.out.println(list);//[NameA:10, NameB:25, NameC:30, NameD:45, NameE:50]

list.stream().filter(e->e.age%10==0).map(e->e.name+="CHANGE").collect(Collectors.toList());

System.out.println(list); //[NameACHANGE:10, NameB:25, NameCCHANGE:30, NameD:45, NameECHANGE:50]


ArrayList<String> strList = new ArrayList<>();
strList.add("1");
strList.add("2");
strList.add("3");
strList.add("4");
strList.add("5");

System.out.println(strList);//[1, 2, 3, 4, 5]

List<String> updatedStrList …