java使用集合實現通訊錄功能

本文實例為大家分享了java使用集合實現通訊錄的具體代碼，供大家參考，具體內容如下

代碼有些繁瑣，只適合初學者。

項目1

java通訊錄

方法(聲明方法的類)

代碼塊

代碼塊語法遵循標準markdown代碼，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() { } // 添加聯繫人public HashMap addContact(Person person) { // map集合為空if (this.map.size() == 0) { LinkedList list = new LinkedList(); // 添加到list集合裡list.add(person); this.map.put(person.getFirstCard(), list);// 添加map集合System.out.println(person.getFirstCard()); } else { System.out.println("1111111111111111111"); // 不為空的時候.首先判斷有沒有這個分組Set keySet = this.map.keySet();// 得到所有的鍵key // 遍歷所有鍵for (Object object : keySet) { if (person.getFirstCard().equals(object)) { Object object2 = this.map.get(person.getFirstCard()); LinkedList linkedList = (LinkedList) object2; // 有這個分組linkedList.add(person); } else { // 沒有這個分組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; } // 刪除聯繫人public void remove(Person person) { // 首先找到那個分組// 所有的值Set set = this.map.keySet(); for (Object object : set) { String nameString = person.getFirstCard(); if (nameString.equals(object)) { // 找見分組Collection collection = this.map.values(); for (Object object1 : collection) {// list數組LinkedList list1 = (LinkedList) object1;// 強制轉換for (Object object2 : list1) {// 遍歷Person person2 = (Person) object2;// if (person.getNameString().equals( person2.getNameString())) { if (list1.size() == 1) { this.map.remove(person2.getFirstCard());// 刪除整個分組show(); } else { list1.remove(person2); show(); } } } } } } } // 展示方法public void show() { System.out.println("*************************************"); System.out.println("請選擇功能"); String[] newArrayStrings = { "1.添加聯繫人", "2.刪除聯繫人", "3.修改聯繫人", "4.展示所有聯繫人" }; 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; } } // 修改聯繫人信息public void upPerson() { Person person = new Person(); System.out.println("請輸入要修改人的姓名:"); Scanner scanner = new Scanner(System.in); String naString = scanner.next(); person.setNameString(naString); shanChu(person); } // 輸入新的人名,年齡public void cc(Person person) { Scanner scanner = new Scanner(System.in); System.out.println("請輸入新的名字:"); String naString2 = scanner.next(); System.out.println("請輸入新的年齡:"); int age = scanner.nextInt(); System.out.println("請輸入新的分組"); String group = scanner.next(); upPersonMessage(person, naString2, group, age); } // 判斷有沒有這個人public void shanChu(Person person) { if (this.map.isEmpty()) { System.out.println("通訊錄為空,修改失敗"); System.out.println("是否添加聯繫人?(Yes/No)"); Scanner scanner = new Scanner(System.in); String nameString = scanner.next(); if (nameString.equals("Yes")) { addPerosn(); } else { System.out.println("傻逼,滾你媽"); } } 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,通訊錄有此人"); cc(person); } else { System.out.println("輸入有誤"); } } } } public Person addPerosn() { Person p = new Person(); System.out.println("請輸入添加人名字:"); Scanner scanner = new Scanner(System.in); // 姓名String name = scanner.next(); // 年齡System.out.println("請輸入年齡:"); int age = scanner.nextInt(); // 分組System.out.println("請輸入分組名稱:"); String firstCardString = scanner.next(); p.setFirstCard(firstCardString); p.setAge(age); p.setNameString(name); System.out.println(p); addContact(p); System.out.println("是否繼續操作?y/n"); if (scanner.next().equals("y")) { show(); } else { System.out.println("***************歡迎您下次再來****************"); } return p; } public Person removePerson() { Person p = new Person(); System.out.println("請輸入刪除人名字:"); Scanner scanner = new Scanner(System.in); // 姓名String name = scanner.next(); // 年齡System.out.println("請輸入刪除人的年齡:"); int age = scanner.nextInt(); // 分組System.out.println("請輸入刪除的分組名稱:"); String firstCardString = scanner.next(); p.setFirstCard(firstCardString); p.setAge(age); p.setNameString(name); remove(p); return p; } // 修改聯繫人public HashMap upPersonMessage(Person person, String nameString, String firstCard, int age) { // 判斷有沒有此聯繫人if (this.map.isEmpty()) { System.out.println("通訊錄為空"); } else { String name = person.getFirstCard(); // 找聯繫人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())) { // 相等話,說明有這個人System.out.println("有次聯繫人"); 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; } // 顯示所有的聯繫人public void printResult(HashMap map1) { if (map1.isEmpty()) { System.out.println("通訊錄為空"); } else { System.out.println(map1); Scanner scanner = new Scanner(System.in); System.out.println("是否繼續y/n"); if (scanner.next().equals("y")) { show(); } else { System.out.println("***************歡迎您下次再來****************"); } } }}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() + "年齡:" + this.age + "分組:" + this.firstCard; }}

腳註

項目2

測試類

代碼塊

代碼塊語法遵循標準markdown代碼，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(); }}

感謝瀏覽。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。