java - 与 Collection 值(value)比较

Question

我有Collection<Student>并想要返回学生列表与过滤器进行比较。 为此我有以下代码

public Collection<Student> findStudents(String filter) {

    return // ?
}

我的问题是使用WhereIn/Contains 的返回语句应该是什么？

Answer 1

使用谷歌 Guava :

过滤Collection学生姓名

public Collection<String> findStudents(String filter) {

    Iterable<String> filteredStudents = Iterables.filter(listOfStudentNames, Predicates.containsPattern(filter));
    return Lists.newArrayList(filteredStudents);
}

过滤Collection<Student>

public Collection<Student> findStudents(String filter) {
  Iterable<Student> filteredStudents = Iterables.filter(listOfStudents, new Predicate<Student>() {
    @Override
    public boolean apply(Student student) {
      return student.getName().contains(filter);
    }
  }
}
return Lists.newArrayList(filteredStudents);

示例:

Iterable<String> filtered = Iterables.filter(Arrays.asList("asdf", "bsdf", "eeadd", "asdfeeee", "123"), Predicates.containsPattern("df"));

filtered现在包含[asdf, bsdf, asdfeeee]