你可以这样做:

List<User> users = Lists.newArrayList(
  new User("Pedro", 12), 
  new User("Maria", 10), 
  new User("Rafael",12)
);

users.sort(
  Comparator.comparing(User::getName).thenComparing(User::getAge)
);

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);
    }
}

Arrays.sort(persons, new PersonComparator());



import java.util.Comparator;

public class PersonComparator implements Comparator<? extends Person> {

    @Override
    public int compare(Person o1, Person o2) {
        if(null == o1 || null == o2  || null == o1.getName() || null== o2.getName() ){
            throw new NullPointerException();
        }else{
            int nameComparisonResult = o1.getName().compareTo(o2.getName());
            if(0 == nameComparisonResult){
                return o1.getAge()-o2.getAge();
            }else{
                return nameComparisonResult;
            }
        }
    }
}


class Person{
    int age; String name;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

}

升级版:

public class PersonComparator implements Comparator<? extends Person> {

   @Override
   public int compare(Person o1, Person o2) {

      int nameComparisonResult = o1.getName().compareToIgnoreCase(o2.getName());
      return 0 == nameComparisonResult?o1.getAge()-o2.getAge():nameComparisonResult;

   }
 }

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;
}
}

使用Comparator，然后将对象放入Collection，然后Collections.sort();

class Person {

    String fname;
    String lname;
    int age;

    public Person() {
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getFname() {
        return fname;
    }

    public void setFname(String fname) {
        this.fname = fname;
    }

    public String getLname() {
        return lname;
    }

    public void setLname(String lname) {
        this.lname = lname;
    }

    public Person(String fname, String lname, int age) {
        this.fname = fname;
        this.lname = lname;
        this.age = age;
    }

    @Override
    public String toString() {
        return fname + "," + lname + "," + age;
    }
}

public class Main{

    public static void main(String[] args) {
        List<Person> persons = new java.util.ArrayList<Person>();
        persons.add(new Person("abc3", "def3", 10));
        persons.add(new Person("abc2", "def2", 32));
        persons.add(new Person("abc1", "def1", 65));
        persons.add(new Person("abc4", "def4", 10));
        System.out.println(persons);
        Collections.sort(persons, new Comparator<Person>() {

            @Override
            public int compare(Person t, Person t1) {
                return t.getAge() - t1.getAge();
            }
        });
        System.out.println(persons);

    }
}

您需要实现自己的Comparator，然后使用它:例如

Arrays.sort(persons, new PersonComparator());

你的比较器可以看起来像这样:

public class PersonComparator implements Comparator<? extends Person> {

  public int compare(Person p1, Person p2) {
     int nameCompare = p1.name.compareToIgnoreCase(p2.name);
     if (nameCompare != 0) {
        return nameCompare;
     } else {
       return Integer.valueOf(p1.age).compareTo(Integer.valueOf(p2.age));
     }
  }
}

比较程序首先比较两个名字，如果它们不相等，就返回比较结果，否则就返回比较两人年龄时的比较结果。

这段代码只是一个草稿:因为这个类是不可变的，你可以考虑为它构建一个单例，而不是为每次排序创建一个新实例。