java使用集合实现通讯录

秒速五厘米 2022-06-08 01:50 305阅读 0赞

# java使用集合实现通讯录 #

#### 代码有些繁琐,只适合初学者 ####

项目1

java通讯录

方法(声明方法的类)

### 代码块 ###

代码块语法遵循标准markdown代码，例如：

package com.lanou.homwork;
    
    import java.util.Collection;
    import java.util.HashMap;
    import java.util.LinkedList;
    import java.util.Scanner;
    import java.util.Set;
    
    class ContactPerson {
        public HashMap map = null;
    
        public HashMap getMap() {
            return map;
        }
    
        public void setMap(HashMap map) {
            this.map = map;
        }
    
        public ContactPerson(HashMap map) {
            super();
            this.map = map;
        }
    
        public ContactPerson() {
    
        }
    
        // 添加联系人
        public HashMap addContact(Person person) {
    
            // map集合为空
            if (this.map.size() == 0) {
    
                LinkedList list = new LinkedList();
                // 添加到list集合里
                list.add(person);
    
                this.map.put(person.getFirstCard(), list);// 添加map集合
                System.out.println(person.getFirstCard());
            } else {
                System.out.println("1111111111111111111");
                // 不为空的时候.首先判断有没有这个分组
                Set keySet = this.map.keySet();// 得到所有的键key
                // 遍历所有键
                for (Object object : keySet) {
                    if (person.getFirstCard().equals(object)) {
                        Object object2 = this.map.get(person.getFirstCard());
                        LinkedList linkedList = (LinkedList) object2;
                        // 有这个分组
                        linkedList.add(person);
                    } else {
                        // 没有这个分组
                        LinkedList list3 = new LinkedList();
                        list3.add(person);
                        this.map.put(person.getFirstCard(), list3);
                        System.out.println(keySet);
                        System.out.println(map.values());
                        return map;
                    }
                }
            }
    
            return map;
        }
    
        // 删除联系人
        public void remove(Person person) {
            // 首先找到那个分组
            // 所有的值
            Set set = this.map.keySet();
            for (Object object : set) {
                String nameString = person.getFirstCard();
                if (nameString.equals(object)) {
                    // 找见分组
                    Collection collection = this.map.values();
                    for (Object object1 : collection) {
       // list数组
                        LinkedList list1 = (LinkedList) object1;// 强制转换
                        for (Object object2 : list1) {
       // 遍历
                            Person person2 = (Person) object2;//
                            if (person.getNameString().equals(
                                    person2.getNameString())) {
                                if (list1.size() == 1) {
                                    this.map.remove(person2.getFirstCard());// 删除整个分组
                                    show();
                                } else {
                                    list1.remove(person2);
                                    show();
                                }
    
                            }
                        }
                    }
                }
            }
        }
    
        // 展示方法
        public void show() {
            System.out.println("*************************************");
            System.out.println("请选择功能");
            String[] newArrayStrings = { "1.添加联系人", "2.删除联系人", "3.修改联系人",
                    "4.展示所有联系人" };
            for (int i = 0; i < newArrayStrings.length; i++) {
                System.out.println("******" + newArrayStrings[i] + "******");
            }
            System.out.println("*************************************");
            Scanner scanner = new Scanner(System.in);
            int i = scanner.nextInt();
            switch (i) {
            case 1: {
                addPerosn();
    
            }
                break;
            case 2: {
                removePerson();
            }
                break;
            case 3: {
                upPerson();
            }
                break;
            case 4: {
                printResult(this.map);
            }
                break;
    
            default:
                break;
            }
    
        }
    
        // 修改联系人信息
        public void upPerson() {
            Person person = new Person();
            System.out.println("请输入要修改人的姓名:");
            Scanner scanner = new Scanner(System.in);
            String naString = scanner.next();
            person.setNameString(naString);
            shanChu(person);
        }
    
        // 输入新的人名,年龄
        public void cc(Person person) {
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入新的名字:");
            String naString2 = scanner.next();
            System.out.println("请输入新的年龄:");
            int age = scanner.nextInt();
            System.out.println("请输入新的分组");
            String group = scanner.next();
            upPersonMessage(person, naString2, group, age);
        }
    
        // 判断有没有这个人
        public void shanChu(Person person) {
            if (this.map.isEmpty()) {
                System.out.println("通讯录为空,修改失败");
                System.out.println("是否添加联系人?(Yes/No)");
                Scanner scanner = new Scanner(System.in);
                String nameString = scanner.next();
                if (nameString.equals("Yes")) {
                    addPerosn();
                } else {
                    System.out.println("傻逼,滚你妈");
                }
            }
            Collection collection = this.map.values();
            for (Object object : collection) {
                LinkedList list = (LinkedList) object;
                for (Object object2 : list) {
                    Person person2 = (Person) object2;
                    if (person.getNameString().equals(person2.getNameString())) {
                        System.out.println("恭喜你,通讯录有此人");
                        cc(person);
                    } else {
                        System.out.println("输入有误");
                    }
                }
            }
        }
    
        public Person addPerosn() {
            Person p = new Person();
            System.out.println("请输入添加人名字:");
            Scanner scanner = new Scanner(System.in);
            // 姓名
            String name = scanner.next();
            // 年龄
            System.out.println("请输入年龄:");
            int age = scanner.nextInt();
            // 分组
            System.out.println("请输入分组名称:");
            String firstCardString = scanner.next();
            p.setFirstCard(firstCardString);
            p.setAge(age);
            p.setNameString(name);
            System.out.println(p);
            addContact(p);
            System.out.println("是否继续操作?y/n");
            if (scanner.next().equals("y")) {
                show();
            } else {
                System.out.println("***************欢迎您下次再来****************");
    
            }
            return p;
        }
    
        public Person removePerson() {
            Person p = new Person();
            System.out.println("请输入删除人名字:");
            Scanner scanner = new Scanner(System.in);
            // 姓名
            String name = scanner.next();
            // 年龄
            System.out.println("请输入删除人的年龄:");
            int age = scanner.nextInt();
            // 分组
            System.out.println("请输入删除的分组名称:");
            String firstCardString = scanner.next();
            p.setFirstCard(firstCardString);
            p.setAge(age);
            p.setNameString(name);
            remove(p);
            return p;
        }
    
        // 修改联系人
        public HashMap upPersonMessage(Person person, String nameString,
                String firstCard, int age) {
            // 判断有没有此联系人
            if (this.map.isEmpty()) {
                System.out.println("通讯录为空");
            } else {
                String name = person.getFirstCard();
                // 找联系人
                Collection collection = this.map.values();// 得到所有的值
                for (Object object : collection) {
                    LinkedList list = (LinkedList) object;
                    for (Object object2 : list) {
                        Person p = (Person) object2;
                        if (person.getNameString().equals(p.getNameString())) {
                            // 相等话,说明有这个人
                            System.out.println("有次联系人");
                            if (list.size() == 1) {
                                this.map.remove(p.getFirstCard());
    
                                Person person2 = new Person();
                                person2.setAge(age);
                                person2.setFirstCard(firstCard);
                                person2.setNameString(nameString);
                                LinkedList list2 = new LinkedList();
                                list2.add(person2);
                                this.map.put(person2.getFirstCard(), list2);
                                System.out.println(this.map);
                            } else {
                                Person person2 = new Person();
                                person2.setAge(age);
                                person2.setFirstCard(firstCard);
                                person2.setNameString(nameString);
                                list.add(person2);
                                System.out.println(this.map);
                            }
    
                        }
    
                    }
                }
            }
            return map;
        }
    
        // 显示所有的联系人
        public void printResult(HashMap map1) {
            if (map1.isEmpty()) {
                System.out.println("通讯录为空");
            } else {
                System.out.println(map1);
                Scanner scanner = new Scanner(System.in);
                System.out.println("是否继续y/n");
                if (scanner.next().equals("y")) {
                    show();
                } else {
                    System.out.println("***************欢迎您下次再来****************");
    
                }
            }
        }
    }
    
    class Person {
    
        private String nameString;
        private String firstCard;
        private int age;
    
        public String getNameString() {
            return nameString;
        }
    
        public void setNameString(String nameString) {
            this.nameString = nameString;
        }
    
        public String getFirstCard() {
            return firstCard;
        }
    
        public void setFirstCard(String firstCard) {
            this.firstCard = firstCard;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public Person() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        public Person(String nameString, String firstCard) {
            this.nameString = nameString;
            this.firstCard = firstCard;
        }
    
        public Person(String nameString, String firstCard, int age) {
            this(nameString, firstCard);
            this.age = age;
        }
    
        @Override
        public String toString() {
            return "姓名:" + this.getNameString() + "年龄:" + this.age + "分组:"
                    + this.firstCard;
        }
    }

### 脚注 ###

项目２

测试类

### 代码块 ###

代码块语法遵循标准markdown代码，例如：

package com.lanou.homwork;
    
    import java.util.HashMap;
    
    public class TestPerson { 
    
        public static void main(String[] args) {
    
            HashMap map = new HashMap();
             ContactPerson contactperson = new ContactPerson(map);
    
             contactperson.show();
        }
    }

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