二人同心，其利断金；同心之言，其臭如兰——《周易·系辞上》
引入依赖：
代码语言：javascript复制<!-- https://search.maven.org/artifact/io.github.vampireachao/stream-query -->
<dependency>
<groupId>io.github.vampireachao</groupId>
<artifactId>stream-core</artifactId>
<version>${stream-query-version}</version>
</dependency>使用：
代码语言：javascript复制@Test
void testFilterTree() {
List<Student> studentTree = asList(
Student.builder().id(1L).name("dromara")
.children(asList(Student.builder().id(3L).name("hutool").parentId(1L)
.children(singletonList(Student.builder().id(6L).name("looly").parentId(3L).build()))
.build(),
Student.builder().id(4L).name("sa-token").parentId(1L)
.children(singletonList(Student.builder().id(7L).name("click33").parentId(4L).build()))
.build()))
.build(),
Student.builder().id(2L).name("baomidou")
.children(singletonList(
Student.builder().id(5L).name("mybatis-plus").parentId(2L)
.children(singletonList(
Student.builder().id(8L).name("jobob").parentId(5L).build()
))
.build()))
.build()
);
Assertions.assertEquals(singletonList(
Student.builder().id(1L).name("dromara")
.children(singletonList(Student.builder().id(3L).name("hutool").parentId(1L)
.children(singletonList(Student.builder().id(6L).name("looly").parentId(3L).build()))
.build()))
.build()), Steam.of(studentTree).filterTree(Student::getChildren, Student::setChildren, s -> "looly".equals(s.getName())).toList());
}
@Data
@Builder
public static class Student {
@Tolerate
public Student() {
// this is an accessible parameterless constructor.
}
private String name;
private Integer age;
private Long id;
private Long parentId;
private List<Student> children;
private Boolean matchParent;
}
