1 package com.collection.students.pojo;
 2 
 3 public class Student {
 4     private String sno;
 5     private String gender;
 6     private String name;
 7     private String clas;
 8     
 9     public Student() {
10 
11     }
12     public Student(String sno, String name, String gender, String clas) {
13         super();
14         this.sno = sno;
15         this.gender = gender;
16         this.name = name;
17         this.clas = clas;
18     }
19     
20     public String getSno() {
21         return sno;
22     }
23     public void setSno(String sno) {
24         this.sno = sno;
25     }
26     public String getGender() {
27         return gender;
28     }
29     public void setGender(String gender) {
30         this.gender = gender;
31     }
32     public String getName() {
33         return name;
34     }
35     public void setName(String name) {
36         this.name = name;
37     }
38     public String getClas() {
39         return clas;
40     }
41     public void setClas(String clas) {
42         this.clas = clas;
43     }
44     @Override
45     public String toString() {
46         return  sno + "\t" + name + "\t" + gender
47                 + "\t" + clas;
48     }
49     
50     
51     
52 }

package com.collection.students.data;

import java.util.HashSet;

import com.collection.students.pojo.Student;


public class StuDatas {
    private HashSet<Student> set;
    
    public StuDatas() {
        this.set = new HashSet<Student>();
    }

    public HashSet<Student> getSet() {
        return set;
    }

    public void setSet(HashSet<Student> set) {
        this.set = set;
    }
    
}

package com.collection.students.service;

import java.util.Iterator;

import com.collection.students.data.StuDatas;
import com.collection.students.pojo.Student;

public class StuSer {

    private Student tempStu;
    private StuDatas datas;
    private Iterator<Student> iterator;
    private boolean judge;

    public StuSer() {
        this.datas = new StuDatas();
        judge = false;
        tempStu = null;
    }

    public void addStu(Student student) {
        iterator = datas.getSet().iterator();
        System.out.println("添加前学生人数："+datas.getSet().size());
        datas.getSet().add(student);
        System.out.println("添加成功");
        System.out.println("添加后学生人数："+datas.getSet().size());
        System.out.println(iterator.hasNext());
    }

    public void delStu(Student student) {
        iterator = datas.getSet().iterator();
        datas.getSet().remove(student);
        System.out.println("删除成功");
    }

    public void editStu(Student student) {
        iterator = datas.getSet().iterator();
        while (iterator.hasNext()) {
            tempStu = iterator.next();
            if (tempStu.getSno().equals(student.getSno())) {
                tempStu.setGender(student.getGender());
                tempStu.setClas(student.getClas());
                tempStu.setName(student.getName());
                judge = true;
                break;
            }
        }
        if (judge) {
            System.out.println("修改成功");
            judge = false;// 恢复原值
        } else {
            System.out.println("修改失败，未找到这样学号的学生");
        }
    }

    public Student searchStuBySno(String str) {
        iterator = datas.getSet().iterator();
        while (iterator.hasNext()) {
            tempStu = iterator.next();
            if (tempStu.getSno().equals(str)) {
                System.out.println("查到该学号的同学");
                System.out.println("该学生的信息如下：");
                showStu(tempStu);
                judge = true;
                break;
            }
        }
        if (judge) {
            judge = false;// 恢复原值
            return tempStu;
        } else {
            System.out.println("未找到这样学号的学生");
            return null;
        }
    }

    public Student searchStuByName(String str) {
        iterator = datas.getSet().iterator();
        while (iterator.hasNext()) {
            tempStu = iterator.next();
            if (isNameAlike(tempStu.getName(), str)) {
                showStu(tempStu);
                judge = true;
                break;
            }
        }
        if (judge) {
            judge = false;// 恢复原值
            return tempStu;
        } else {
            System.out.println("未找到姓名与输入文字相似的学生");
            return null;
        }
    }

    public void showStu(Student student) {
        System.out.println(student.toString());
    }

    public void showAllStu() {
        iterator = datas.getSet().iterator();
        if (!iterator.hasNext()) {
            System.out.println("暂无学生，你可以选择添加学生");
            return;
        }
        System.out.println("所有学生的信息如下：");
        while (iterator.hasNext()) {
            tempStu = iterator.next();
            showStu(tempStu);
        }
    }

    public Student creatStu(String string) {
        String[] tempString = string.split(",");
        return tempStu = new Student(tempString[0], tempString[1],
                tempString[2], tempString[3]);
    }

    // 按学号判断是否已经存在该学生
    public boolean isStuPresent(Student student) {
        iterator = datas.getSet().iterator();
        while (iterator.hasNext()) {
            if (iterator.next().equals(student)) {
                return true;
            }
        }
        return false;
    }
    public boolean isNameAlike(String s1, String s2) {
        for (int i = 0; i < s1.length(); i++) {
            for (int j = 0; j < s2.length(); j++) {
                if (s1.substring(i, i + 1).equals(s2.subSequence(j, j + 1))) {
                    return true;
                }
            }
        }
        return false;
    }
}

package com.collection.students.view;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

import com.collection.students.data.StuDatas;
import com.collection.students.pojo.Student;
import com.collection.students.service.StuSer;

public class StuMain {
    public static void main(String[] args) {
        StuSer stuSer = new StuSer();
        Scanner scanner = new Scanner(System.in);
        String choice;
        String input;
        Student student = null;

        while (true) {

            printMenu();
            choice = scanner.nextLine();

            if ("1".equals(choice)) {
                System.out.println("请输入学生的姓名，性别，班级（逗号隔开）");
                String temp = "," + scanner.nextLine();
                input = generateSno() + temp;
                if ((student = stuSer.creatStu(input)) != null) {
                    while (stuSer.isStuPresent(student)) {
                        //如果学号存在则重新产生学号
                        input = generateSno() + temp;
                        student = stuSer.creatStu(input);
                    }
                    stuSer.addStu(student);
                    System.out.println("该生的学号为：" + student.getSno());
                } else {
                    System.out.println("输入的信息不合法");
                }
            }
            if ("2".equals(choice)) {
                System.out.println("请输入学生的学号");
                input = scanner.nextLine();
                student = stuSer.searchStuBySno(input);
                if (student==null) {
                    System.out.println("删除失败");
                }else{
                    stuSer.delStu(student);
                }
            }
            if ("3".equals(choice)) {
                stuSer.showAllStu();
            }
            if ("4".equals(choice)) {
                System.out.println("输入要修改的学生的学号及新的学生姓名，性别，班级（逗号隔开）");
                input = scanner.nextLine();
                student = stuSer.creatStu(input);
                if (student != null) {
                    stuSer.editStu(student);
                }else {
                    System.out.println("输入不合法");
                }
            }
            if ("5".equals(choice)) {
                System.out.println("请输入姓名");
                input = scanner.nextLine();
                stuSer.searchStuByName(input);
            }
            if ("6".equals(choice)) {
                System.out.println("已退出系统");
                System.exit(0);
            }
        }
    }

    public static void printMenu() {
        System.out
                .println("请选择操作序号：\n1.添加学生\n2.删除学生\n3.显示所有学生\n4.更改学生信息\n5.姓名模糊查找\n6.退出\n");

    }

    public static String generateSno() {
        Date date = new Date();
        String str;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");

        String ran = "" + (int) (Math.random() * 10000);
        StringBuffer sbf = new StringBuffer("");
        for (int i = 0; i < 4 - ran.length(); i++) {
            sbf.append(‘0‘);
        }
        str = dateFormat.format(date);
        return str = str + sbf.toString() + ran;
    }
}