java使用集合实现通讯录功能

本文实例为大家分享了java使用集合实现通讯录的具体代码，供大家参考，具体内容如下

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。

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