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();
    }
}

感谢浏览……………………………..