对于那些能够使用Java 8流API的人来说，这里有一个更整洁的方法: lambda和排序

我正在寻找相当于c# LINQ:

.ThenBy(...)

我在Comparator上找到了Java 8的机制:

.thenComparing(...)

下面是演示算法的代码片段。

    Comparator<Person> comparator = Comparator.comparing(person -> person.name);
    comparator = comparator.thenComparing(Comparator.comparing(person -> person.age));

请查看上面的链接，以获得更简洁的方法，并解释Java的类型推断如何使其与LINQ相比定义起来更笨拙。

下面是完整的单元测试供参考:

@Test
public void testChainedSorting()
{
    // Create the collection of people:
    ArrayList<Person> people = new ArrayList<>();
    people.add(new Person("Dan", 4));
    people.add(new Person("Andi", 2));
    people.add(new Person("Bob", 42));
    people.add(new Person("Debby", 3));
    people.add(new Person("Bob", 72));
    people.add(new Person("Barry", 20));
    people.add(new Person("Cathy", 40));
    people.add(new Person("Bob", 40));
    people.add(new Person("Barry", 50));

    // Define chained comparators:
    // Great article explaining this and how to make it even neater:
    // http://blog.jooq.org/2014/01/31/java-8-friday-goodies-lambdas-and-sorting/
    Comparator<Person> comparator = Comparator.comparing(person -> person.name);
    comparator = comparator.thenComparing(Comparator.comparing(person -> person.age));

    // Sort the stream:
    Stream<Person> personStream = people.stream().sorted(comparator);

    // Make sure that the output is as expected:
    List<Person> sortedPeople = personStream.collect(Collectors.toList());
    Assert.assertEquals("Andi",  sortedPeople.get(0).name); Assert.assertEquals(2,  sortedPeople.get(0).age);
    Assert.assertEquals("Barry", sortedPeople.get(1).name); Assert.assertEquals(20, sortedPeople.get(1).age);
    Assert.assertEquals("Barry", sortedPeople.get(2).name); Assert.assertEquals(50, sortedPeople.get(2).age);
    Assert.assertEquals("Bob",   sortedPeople.get(3).name); Assert.assertEquals(40, sortedPeople.get(3).age);
    Assert.assertEquals("Bob",   sortedPeople.get(4).name); Assert.assertEquals(42, sortedPeople.get(4).age);
    Assert.assertEquals("Bob",   sortedPeople.get(5).name); Assert.assertEquals(72, sortedPeople.get(5).age);
    Assert.assertEquals("Cathy", sortedPeople.get(6).name); Assert.assertEquals(40, sortedPeople.get(6).age);
    Assert.assertEquals("Dan",   sortedPeople.get(7).name); Assert.assertEquals(4,  sortedPeople.get(7).age);
    Assert.assertEquals("Debby", sortedPeople.get(8).name); Assert.assertEquals(3,  sortedPeople.get(8).age);
    // Andi     : 2
    // Barry    : 20
    // Barry    : 50
    // Bob      : 40
    // Bob      : 42
    // Bob      : 72
    // Cathy    : 40
    // Dan      : 4
    // Debby    : 3
}

/**
 * A person in our system.
 */
public static class Person
{
    /**
     * Creates a new person.
     * @param name The name of the person.
     * @param age The age of the person.
     */
    public Person(String name, int age)
    {
        this.age = age;
        this.name = name;
    }

    /**
     * The name of the person.
     */
    public String name;

    /**
     * The age of the person.
     */
    public int age;

    @Override
    public String toString()
    {
        if (name == null) return super.toString();
        else return String.format("%s : %d", this.name, this.age);
    }
}

对于像这样的一本书:

package books;

public class Book {

    private Integer id;
    private Integer number;
    private String name;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getNumber() {
        return number;
    }

    public void setNumber(Integer number) {
        this.number = number;
    }

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "book{" +
                "id=" + id +
                ", number=" + number +
                ", name='" + name + '\'' + '\n' +
                '}';
    }
}

用模拟对象对主类进行排序

package books;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;


public class Main {

    public static void main(String[] args) {
        System.out.println("Hello World!");

        Book b = new Book();

        Book c = new Book();

        Book d = new Book();

        Book e = new Book();

        Book f = new Book();

        Book g = new Book();
        Book g1 = new Book();
        Book g2 = new Book();
        Book g3 = new Book();
        Book g4 = new Book();




        b.setId(1);
        b.setNumber(12);
        b.setName("gk");

        c.setId(2);
        c.setNumber(12);
        c.setName("gk");

        d.setId(2);
        d.setNumber(13);
        d.setName("maths");

        e.setId(3);
        e.setNumber(3);
        e.setName("geometry");

        f.setId(3);
        f.setNumber(34);
        b.setName("gk");

        g.setId(3);
        g.setNumber(11);
        g.setName("gk");

        g1.setId(3);
        g1.setNumber(88);
        g1.setName("gk");
        g2.setId(3);
        g2.setNumber(91);
        g2.setName("gk");
        g3.setId(3);
        g3.setNumber(101);
        g3.setName("gk");
        g4.setId(3);
        g4.setNumber(4);
        g4.setName("gk");





        List<Book> allBooks = new ArrayList<Book>();

        allBooks.add(b);
        allBooks.add(c);
        allBooks.add(d);
        allBooks.add(e);
        allBooks.add(f);
        allBooks.add(g);
        allBooks.add(g1);
        allBooks.add(g2);
        allBooks.add(g3);
        allBooks.add(g4);



        System.out.println(allBooks.size());


        Collections.sort(allBooks, new Comparator<Book>() {

            @Override
            public int compare(Book t, Book t1) {
                int a =  t.getId()- t1.getId();

                if(a == 0){
                    int a1 = t.getNumber() - t1.getNumber();
                    return a1;
                }
                else
                    return a;
            }
        });
        System.out.println(allBooks);

    }


   }

您可以使用通用串行比较器按多个字段对集合进行排序。

import org.apache.commons.lang3.reflect.FieldUtils;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

/**
* @author MaheshRPM
*/
public class SerialComparator<T> implements Comparator<T> {
List<String> sortingFields;

public SerialComparator(List<String> sortingFields) {
    this.sortingFields = sortingFields;
}

public SerialComparator(String... sortingFields) {
    this.sortingFields = Arrays.asList(sortingFields);
}

@Override
public int compare(T o1, T o2) {
    int result = 0;
    try {
        for (String sortingField : sortingFields) {
            if (result == 0) {
                Object value1 = FieldUtils.readField(o1, sortingField, true);
                Object value2 = FieldUtils.readField(o2, sortingField, true);
                if (value1 instanceof Comparable && value2 instanceof Comparable) {
                    Comparable comparable1 = (Comparable) value1;
                    Comparable comparable2 = (Comparable) value2;
                    result = comparable1.compareTo(comparable2);
                } else {
                    throw new RuntimeException("Cannot compare non Comparable fields. " + value1.getClass()
                            .getName() + " must implement Comparable<" + value1.getClass().getName() + ">");
                }
            } else {
                break;
            }
        }
    } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    }
    return result;
}
}

让你的person类实现Comparable< person >，然后实现compareTo方法，例如:

public int compareTo(Person o) {
    int result = name.compareToIgnoreCase(o.name);
    if(result==0) {
        return Integer.valueOf(age).compareTo(o.age);
    }
    else {
        return result;
    }
}

它将首先按名称(大小写不敏感)排序，然后按年龄排序。然后可以在Person对象的集合或数组上运行Arrays.sort()或Collections.sort()。

根据需要创建尽可能多的比较器。之后，为每个订单类别调用“then comparison”方法。这是Streams的一种做法。看到的:

//Sort by first and last name
System.out.println("\n2.Sort list of person objects by firstName then "
                                        + "by lastName then by age");
Comparator<Person> sortByFirstName 
                            = (p, o) -> p.firstName.compareToIgnoreCase(o.firstName);
Comparator<Person> sortByLastName 
                            = (p, o) -> p.lastName.compareToIgnoreCase(o.lastName);
Comparator<Person> sortByAge 
                            = (p, o) -> Integer.compare(p.age,o.age);

//Sort by first Name then Sort by last name then sort by age
personList.stream().sorted(
    sortByFirstName
        .thenComparing(sortByLastName)
        .thenComparing(sortByAge)
     ).forEach(person->
        System.out.println(person));        

在多个字段上对用户定义的对象进行排序- Comparator (lambda stream)

使用Java 8 Streams方法，在getter上引用方法…

// Create a stream...
var sortedList = persons.stream()
    // sort it (does not sort the original list)...
    .sorted(Comparator.comparing(Person::getName)
                      .thenComparing(Person::getAge));
    // and collect to a new list
    .collect(Collectors.toList());

集合到数组ist也可以:

persons.stream()
    .sorted(Comparator.comparing(Person::getName)
                      .thenComparing(Person::getAge));
    .toArray(String[]::new);

Java 8 Lambda方法……

//Sorts the original list Lambda style
persons.sort((p1, p2) -> {
        if (p1.getName().compareTo(p2.getName()) == 0) {
            return p1.getAge().compareTo(p2.getAge());
        } else {
            return p1.getName().compareTo(p2.getName());
        } 
    });

最后……

// This syntax is similar to the Streams example above, but sorts the original list!!!
persons.sort(Comparator.comparing(Person::getName).thenComparing(Person::getAge));