?繼承Comparable接口，重寫compareTo方法進行排序：
public class Student implements Comparable<Student>{
?? ?private String name;
?? ?private int id;
?? ?private int age;
?? ?public Student() {
?? ??? ?super();
?? ?}
?? ?public Student(String name, int id, int age) {
?? ??? ?super();
?? ??? ?this.name = name;
?? ??? ?this.id = id;
?? ??? ?this.age = age;
?? ?}
?? ?public String getName() {
?? ??? ?return name;
?? ?}
?? ?public void setName(String name) {
?? ??? ?this.name = name;
?? ?}
?? ?public int getId() {
?? ??? ?return id;
?? ?}
?? ?public void setId(int id) {
?? ??? ?this.id = id;
?? ?}
?? ?public int getAge() {
?? ??? ?return age;
?? ?}
?? ?public void setAge(int age) {
?? ??? ?this.age = age;
?? ?}
?? ?@Override
?? ?public String toString() {
?? ??? ?return "Student [name=" + name + ", id=" + id + ", age=" + age + "]";
?? ?}
?? ?@Override
?? ?public int compareTo(Student s) {
?? ??? ?
?? ??? ?return this.age-s.age;
?? ?}
?? ?
?? ?
}

public class Test01 {

?? ?public static void main(String[] args) {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?List<Student> list = new ArrayList<Student>();
?? ??? ?Student s1 = new Student("張三",1,16);
?? ??? ?Student s2 = new Student("張四",2,12);
?? ??? ?Student s3 = new Student("張五",3,18);
?? ??? ?list.add(s1);list.add(s2);list.add(s3);
?? ??? ?//Collections.sort()會自動調用compareTo（）方法
?? ??? ?Collections.sort(list);
?? ??? ?for (Student student : list) {
?? ??? ??? ?System.out.println(student);
?? ??? ?}
?? ?}

}
運行：
Student [name=張四, id=2, age=12]
Student [name=張三, id=1, age=16]
Student [name=張五, id=3, age=18]

? ?Comparetor下的compare方法排序：

public class Student{
?? ?private String name;
?? ?private int id;
?? ?private int age;
?? ?public Student() {
?? ??? ?super();
?? ?}
?? ?public Student(String name, int id, int age) {
?? ??? ?super();
?? ??? ?this.name = name;
?? ??? ?this.id = id;
?? ??? ?this.age = age;
?? ?}
?? ?public String getName() {
?? ??? ?return name;
?? ?}
?? ?public void setName(String name) {
?? ??? ?this.name = name;
?? ?}
?? ?public int getId() {
?? ??? ?return id;
?? ?}
?? ?public void setId(int id) {
?? ??? ?this.id = id;
?? ?}
?? ?public int getAge() {
?? ??? ?return age;
?? ?}
?? ?public void setAge(int age) {
?? ??? ?this.age = age;
?? ?}
?? ?@Override
?? ?public String toString() {
?? ??? ?return "Student [name=" + name + ", id=" + id + ", age=" + age + "]";
?? ?}
}

public class Test01 {

?? ?public static void main(String[] args) {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?List<Student> list = new ArrayList<Student>();
?? ??? ?Student s1 = new Student("張三",1,16);
?? ??? ?Student s2 = new Student("張四",2,12);
?? ??? ?Student s3 = new Student("張五",3,18);
?? ??? ?list.add(s1);list.add(s2);list.add(s3);
?? ??? ?Collections.sort(list, new Comparator<Student>() {

?? ??? ??? ?@Override
?? ??? ??? ?public int compare(Student o1, Student o2) {
?? ??? ??? ??? ?// TODO Auto-generated method stub
?? ??? ??? ??? ?return o1.getAge()-o2.getAge();
?? ??? ??? ?}

?? ??? ?});
?? ??? ?for (Student student : list) {
?? ??? ??? ?System.out.println(student);
?? ??? ?}
?? ?}

}

運行：
Student [name=張四, id=2, age=12]
Student [name=張三, id=1, age=16]
Student [name=張五, id=3, age=18]

轉載于:https://www.cnblogs.com/snzd9958/p/9792649.html

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