Sắp Xếp Nhiều Trường Bằng Comparator @Override Compare trong Java

Student.java

Java Core 2017

package CompareSort;

import java.util.Comparator;

public class Student implements Comparator<Student> {

    private String name;
    private String address;
    private int age;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Student(String name, String address, int age) {
        super();
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public Student() {
        super();
    }

    @Override
    public int compare(Student o1, Student o2) {
        int sizeName = o1.name.compareTo(o2.name); //Sort name (String)
        if (sizeName != 0) {
            return sizeName;
        }
        int sizeAddress = o1.address.compareTo(o2.address); //Sort Address (String)
        if (sizeAddress != 0) {
            return sizeAddress;
        }
        return o1.age - o2.age; //Sort Age (int)
    }

}

Main.java

Java Core 2017

package CompareSort;

import java.util.ArrayList;
import java.util.Collections;

public class Main {

    public static void main(String[] args) {
        Student a = new Student("A", "B", 6);
        Student b = new Student("C", "B", 5);
        Student c = new Student("C", "B", 3);
        Student d = new Student("A", "B", 1);
        Student e = new Student("C", "B", 4);
        Student f = new Student("A", "B", 7);

        ArrayList<Student> list = new ArrayList<Student>();
        list.add(a);
        list.add(b);
        list.add(c);
        list.add(d);
        list.add(e);
        list.add(f);

        Collections.sort(list, new Student());

        for (Student ss : list) {
            System.out.println(" Name: " + ss.getName() + " Address: " + ss.getAddress() + " Age: " + ss.getAge());
        }
    }
}

Trường hợp thay đổi giá trị thứ tự sắp xếp ưu tiên
Name > Address > Age

 Nếu Name trùng nhau thì sẽ ưu tiến sắp xếp theo Address

Nếu Name và Address có tên trùng nhau thì ưu tiên cuối cũng sẽ sắp xếp theo Age