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  • TreeSet具体应用

    知识是用来运用的,一辈子用不上的等于没学,学了忘了的等于没学,学了不会用的等于没学

     

    //TreeSetDemo2.java


    package saturday2;
    import java.util.HashSet;
    import java.util.Iterator;
    import java.util.TreeSet;
    public class TreeSetDemo2 {
    public static void main(String[] args) {
    TreeSet<Student> t=new TreeSet<Student>();
    Student s1 = new Student("liudehua",52);
    Student s2 = new Student("chenglong",60);
    Student s3 = new Student("zhouxingchi",44);
    Student s4 = new Student("sunyang",34);
    Student s5 = new Student("lingqingxia",36);
    Student s6 = new Student("lingqingxia",26);
    Student s7 = new Student("lingqing",26);
    t.add(s1);
    t.add(s2);
    t.add(s3);
    t.add(s4);
    t.add(s5);
    t.add(s6);
    t.add(s7);
    for(Student st:t){
    System.out.println(st);
    }
    System.out.println("==================");
    System.out.println("华丽的分割线");
    System.out.println("==================");
    Iterator<Student> iterator1 = t.iterator();
    while(iterator1.hasNext()){
    System.out.println(iterator1.next());
    }
    }
    }
     




    //Student.java
     
    package saturday2;
     
    public class Student  implements java.lang.Comparable {//实现Comparable接口,对对象数组排序
    private String name;
    private int age;
    public Student(){
    super();
    }
    public Student(String name, int age){
    super();
    this.name = name;
    this.age = 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 boolean equals(Object obj){
    if(this==obj){
    return true;
    }
    if(!(obj instanceof Student)){
    return false;
    }
    Student s = (Student) obj;
    return(this.age==s.age);
    }
    @Override
     public int compareTo(Object o){      // 实现 Comparable 接口的抽象方法,定义排序规则
                Student p = (Student)o;
                return this.age - p.age;                      // 升序排列,反之降序
         }
    @Override
    public String toString(){
    return("Student  [name="+name+",age="+age+"]");
    }
    }

     

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  • 原文地址:https://www.cnblogs.com/starainDou/p/4677276.html
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