软件设计迭代器模式

信1305班共44名同学，每名同学都有姓名，学号和年龄等属性，分别使用JAVA内置迭代器和C++中标准模板库（STL）实现对同学信息的遍历，要求按照学号从小到大和从大到小两种次序输出学生信息。

package 实验18迭代器模式;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
 * 通过实现comparable接口来比较多个对象的属性值,并按顺序输出
 * @author young
 *
 */
class Student implements Comparable<Student> {
    private int id;
    private String name;
    private int age;
    
     
    public Student(int id, String name, int age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
 
    }
 
    // 三个返回结果都要写出来
    public int compareTo(Student o) {
        if(this.id > o.id){
            return -1;
        }else if(this.id < o.id){
            return 1;
        }else {
            return 0;
        }
    }
    public int compareTo2(Student o) {
        if(this.id < o.id){
            return -1;
        }else if(this.id > o.id){
            return 1;
        }else {
            return 0;
        }
    }
    @Override
    public String toString(){
        return "姓名: " + this.name + ". 学号: " + this.id + ". 年龄: " + this.age
                 ;
    }
}

package 实验18迭代器模式;

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

public class ComparableTest1 {
    public static void main(String[] args) {
        Student s1 = new Student(1, "张三", 50);
        Student s2 = new Student(3, "李1", 30 );
        Student s3 = new Student(5, "王2", 29 );
        Student s4 = new Student(5, "高3", 34 );
        Student s5 = new Student(6, "高3", 34 );
        Student s6 = new Student(58, "高3", 34 );
        Student s7 = new Student(69, "高3", 34 );
        Student s8 = new Student(86, "高3", 34 );
        Student s9 = new Student(28, "高3", 34 );
        Student s10 = new Student(68, "高3", 34 );
        Student s11= new Student(354, "高3", 34 );
        Student s12 = new Student(24, "高3", 34 );
        Student s13= new Student(768, "高3", 34 );
        Student s14 = new Student(270, "高3", 34 );
        Student s15 = new Student(767, "高3", 34 );
        Student s16 = new Student(77, "高3", 34 );
        Student s17 = new Student(78, "高3", 34 );
        Student s18 = new Student(80, "高3", 34 );
        Student s19 = new Student(81, "高3", 34 );
        Student s20 = new Student(82, "高3", 34 );
        Student s21 = new Student(83, "高3", 34 );
        Student s22 = new Student(84, "高3", 34 );
        Student s23 = new Student(85, "高3", 34 );
        Student s24 = new Student(86, "高3", 34 );
        Student s25 = new Student(87, "高3", 34 );
        Student s26 = new Student(88, "高3", 34 );
        Student s27 = new Student(89, "高3", 34 );
        Student s28 = new Student(90, "高3", 34 );
        Student s29 = new Student(91, "高3", 34 );
        Student s30 = new Student(29, "高3", 34 );
        Student s31 = new Student(92, "高3", 34 );
        Student s32 = new Student(93, "高3", 34 );
        Student s33 = new Student(94, "高3", 34 );
        Student s34 = new Student(95, "高3", 34 );
        Student s35 = new Student(96, "高3", 34 );
        Student s36 = new Student(97, "高3", 34 );
        Student s37 = new Student(98, "高3", 34 );
        Student s38 = new Student(99, "高3", 34 );
        Student s39 = new Student(100, "高3", 34 );
        Student s40 = new Student(101, "高3", 34 );
        Student s41 = new Student(102, "高3", 34 );
        Student s42 = new Student(103, "高3", 34 );
        Student s43 = new Student(104, "高3", 34 );
        Student s44 = new Student(105, "高3", 34 );
        
        
        List<Student> list = new ArrayList<Student>();
        list.add(s1);
        list.add(s2);
        list.add(s3);
        list.add(s4);
        list.add(s5);
        list.add(s6);
        list.add(s7);
        list.add(s8);
        list.add(s9);
        list.add(s10);
        list.add(s11);
        list.add(s12);
        list.add(s13);
        list.add(s14);
        list.add(s15);
        list.add(s16);
        list.add(s17);
        list.add(s18);
        list.add(s19);
        list.add(s20);
        list.add(s21);
        list.add(s22);
        list.add(s23);
        list.add(s24);
        list.add(s25);
        list.add(s26);
        list.add(s27);
        list.add(s28);
        list.add(s29);
        list.add(s30);
        list.add(s31);
        list.add(s32);
        list.add(s33);
        list.add(s34);
        list.add(s35);
        list.add(s36);
        list.add(s37);
        list.add(s38);
        list.add(s39);
        list.add(s40);
        list.add(s41);
        list.add(s42);
        list.add(s43);
        list.add(s44);
      
        Collections.sort(list);
        System.out.println("按照学号从大到小进行排序输出: ");
        for(Student stu : list){
            System.out.println(stu.toString());
        }
    }
}