TreeSet两种排序方式_2种treeset排序方式的使用办法-优快云博客

本文链接：https://blog.youkuaiyun.com/wang_ouyangsima/article/details/87879449

本文介绍如何使用Java实现学生对象的年龄排序，通过两种方法：一是使用Comparator接口自定义比较器，二是实现Comparable接口进行对象自身排序。展示了具体的代码实现及运行结果。

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方法1；
   public class Student {

   private int age;
   private 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;
       }

       @Override
       public String toString() {
           return "Student [age=" + age + ", name=" + name + "]";
       }

       public Student(int age, String name) {
           super();
           this.age = age;
           this.name = name;
       }
   }
   -------------------------
   public static void main(String[] args) {
       //Comparator--java.util
       Set<Student> treeSet = new TreeSet<Student>(new Comparator<Student>() {

           @Override
           public int compare(Student o1, Student o2) {
               // TODO Auto-generated method stub
               return o1.getAge()-o2.getAge();
           }
       });
       treeSet.add(new Student(18, "zhangsan"));
       treeSet.add(new Student(35, "wangwu"));
       treeSet.add(new Student(23, "lisi"));
       for (Student student : treeSet) {
           System.out.println(student.getAge()+"+"+student.getName());
       }
   }
方法二：
   //Comparable--java.lang
   public class Student implements Comparable<Student>{

private int age;
private 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;
   }

   @Override
   public String toString() {
       return "Student [age=" + age + ", name=" + name + "]";
   }

   /**
   * @param age
   * @param name
   */
   public Student(int age, String name) {
       super();
       this.age = age;
       this.name = name;
   }

   /* (non-Javadoc)
   * @see java.lang.Comparable#compareTo(java.lang.Object)
   */
       @Override
       public int compareTo(Student o) {
           // TODO Auto-generated method stub
           return this.age-o.age;
       }
   }
   -------------------------------
   public static void main(String[] args) {
           Set<Student> set = new TreeSet<Student>();
           set.add(new Student(18, "zhangsan"));
           set.add(new Student(35, "wangwu"));
           set.add(new Student(23, "lisi"));
           for (Student student : set) {
               System.out.println(student.getAge()+"+"+student.getName());
           }
       }
   结果：18+zhangsan
               23+lisi
               35+wangwu