[Java Spring Data] Query by example

    @Test
    public void queryByExample() {
        System.out.println("\nFind the Department with the name 'Humanities' \n" +
                departmentRepository.findOne(Example.of(new Department("Humanities", null))));


        System.out.println("\nFind Departments with the first name of the chair is 'John'");
        departmentRepository.findAll(Example.of(
                new Department(null, new Staff(new Person("John", null))))).forEach(System.out::println);

        System.out.println("\nFind All Departments with the name ending in 'sciences', case insensitive");
        departmentRepository.findAll(Example.of(new Department("sciences", null),
                ExampleMatcher.matching().
                        withIgnoreCase().
                        withStringMatcher(ExampleMatcher.StringMatcher.ENDING))).forEach(System.out::println);

    }

　　

@Embeddable
public class Person {
    @Column
    private String firstName;

    @Column
    private String lastName;

    public Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    protected Person() {
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    @Override
    public String toString() {
        return  " firstName='" + firstName + '\'' +
                ", lastName='" + lastName + "\' ";
    }
}

@Entity
@Table(name="Department")
public class Department {
    @Id
    @GeneratedValue
    private Integer id;

    @Column
    private String name;

    @OneToOne
    private Staff chair;

    @OneToMany(fetch = FetchType.EAGER,mappedBy="department",
            cascade = CascadeType.ALL)
    private List<Course> courses = new ArrayList<>();

    public Department(String name, Staff chair) {
        this.name = name;
        this.chair = chair;
    }

    protected Department() {
    }

    public Integer getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void addCourse(Course course) {
        courses.add(course);
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setChair(Staff chair) {
        this.chair = chair;
    }

    public void setCourses(List<Course> courses) {
        this.courses = courses;
    }

    @Override
    public String toString() {
        return "Department{" +
                "chair=" + chair +
                ", name='" + name + '\'' +
                ", id=" + id +
                '}';
    }
}