迭代器模式--Java实现

具体代码

//Student.java
package org.example.test016;

public class Student {
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getAge() {
        return age;
    }

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

    @Override
        public String toString() {
        return "学号： " + id + ",姓名： " + name + ",年龄： " + age;
    }

    public Student(String id, String name, String age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    private String id;
    private String name;
    private String age;

    public static Student readString(String s) {
        String[] text = s.split(",");
        if (text.length == 3) {
            return new Student(text[0], text[1], text[2]);
        }
        else {
            throw new RuntimeException("读取信息出现问题~");
        }
    }



}

//Operator.java
package org.example.test016;

import java.io.*;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

public class Operator {
    public static void main(String[] args) throws IOException {
        File file = new File("F:\\Data\\softwareDesign\\softwareDesignTest002\\src\\main\\java\\org\\example\\test016\\Student.txt");
        InputStream inputStream = new FileInputStream(file);
        List<Student> list = getStudents(inputStream);

        System.out.println("学号从小到大：");
        Iterator<Student> iterator = list.iterator();
        while (iterator.hasNext()) {
            Student student = iterator.next();
            System.out.println(student);
        }

        System.out.println("学号从大到小：");
        ListIterator<Student> listIterator = list.listIterator();
        for (listIterator = list.listIterator(); listIterator.hasNext();) {
            listIterator.next();
        }

        for (; listIterator.hasPrevious();) {
            Student student = listIterator.previous();
            System.out.println(student);
        }

    }

    public static List<Student> getStudents(InputStream inputStream) throws IOException {
        List<Student> list = new LinkedList<>();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        String text = null;
        while ((text = bufferedReader.readLine()) != null) {
            Student student = Student.readString(text);
            list.add(student);
        }

        return list;
    }
}

运行结果