java使用集合實現通訊錄功能，java集合實現通訊錄

java使用集合實現通訊錄功能，java集合實現通訊錄

本文執行個體為大家分享了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

代碼塊文法遵循標準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() {  }  // 新增連絡人...  public HashMap addContact(Person person) {    // map集合為空白    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");      // 不為空白的時候.首先判斷有沒有這個分組      Set keySet = this.map.keySet();// 得到所有的鍵key      // 遍曆所有鍵      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;  }  // 刪除連絡人  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) {// 遍曆            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.新增連絡人...", "2.刪除連絡人", "3.修改連絡人",        "4.展示所有連絡人" };    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;    }  }  // 修改連絡人資訊  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("通訊錄為空白,修改失敗");      System.out.println("是否新增連絡人...?(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;  }  // 修改連絡人  public HashMap upPersonMessage(Person person, String nameString,      String firstCard, int age) {    // 判斷有沒有此連絡人    if (this.map.isEmpty()) {      System.out.println("通訊錄為空白");    } else {      String name = person.getFirstCard();      // 找連絡人      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("有次連絡人");            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;  }  // 顯示所有的連絡人  public void printResult(HashMap map1) {    if (map1.isEmpty()) {      System.out.println("通訊錄為空白");    } 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

測試類別

代碼塊

代碼塊文法遵循標準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。

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