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……………………………..