这是我的第四篇文章

面向对象

实现通讯录系统

Contact类

java
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import java.io.Serializable;

class Contaxt implements Serializable {
    int id;
    String name;
    String tel;
    String address;
    boolean flag;

    public Contaxt(int id, String name, String tel, String address) {
        this.id = id;
        this.name = name;
        this.tel = tel;
        this.address = address;
        flag = false;
    }

    public boolean getFlag() {
        return flag;
    }

    public void setFlag(boolean flag) {
        this.flag = flag;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public String getTel() {
        return tel;
    }

    public String getAddress() {
        return address;
    }

    @Override
    public String toString() {
        return "Contaxt{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", tel='" + tel + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}


AddressBook

java
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import java.io.*;
import java.util.ArrayList;

import java.util.Scanner;

public class AddressBook {

    ArrayList<Contaxt> contaxts = new ArrayList<>();

    public void addContaxt() {
        System.out.println("请输入姓名：");
        Scanner sc = new Scanner(System.in);
        String name = sc.next();

        System.out.println("请输入电话：");
        String tel = sc.next();

        System.out.println("请输入地址：");
        String address = sc.next();

        int id = contaxts.size() == 0 ? 1 : contaxts.get(contaxts.size()-1).getId() + 1;
        Contaxt contaxt = new Contaxt(id,name,tel,address);
        contaxts.add(contaxt);

        System.out.println("添加成功");
        System.out.println(contaxt);
        save();
    }

    public void showAll() {
        for ( Contaxt contaxt : contaxts) {
            if(contaxt.getFlag()==false)
            System.out.println(contaxt);
        }
    }

    public void searchID() {
        System.out.println("请输入ID:");
        Scanner sc = new Scanner(System.in);
        int id = sc.nextInt();

        for (Contaxt contaxt:contaxts) {
            if(id == contaxt.id && contaxt.getFlag() == false) {
                System.out.println(contaxt);
                return ;
            }
        }

        System.out.println("ID:"+id+" 不存在");
    }

    public void deleteID() {
        System.out.println("请输入ID:");
        Scanner sc = new Scanner(System.in);
        int id = sc.nextInt();

        for (Contaxt contaxt:contaxts) {
            if(id == contaxt.id && contaxt.getFlag() == false) {
                System.out.println("已删除");
                System.out.println(contaxt);
                contaxt.setFlag(true);
                save();
                return ;
            }
        }

        System.out.println("ID:"+id+" 不存在");
    }

    public void changeID() {
        System.out.println("请输入ID:");
        Scanner sc = new Scanner(System.in);
        int id = sc.nextInt();

        for (Contaxt contaxt:contaxts) {
            if(id == contaxt.id && contaxt.getFlag() == false) {
                System.out.println(contaxt);

                int op = sc.nextInt();


                System.out.println("请输入姓名：");
                String name = sc.next();
                contaxt.setName(name);

                System.out.println("请输入电话：");
                String tel = sc.next();
                contaxt.setTel(tel);

                System.out.println("请输入地址：");
                String address = sc.next();
                contaxt.setAddress(address);

                System.out.println("修改成功");
                System.out.println(contaxt);
                save();
                return ;
            }
        }

        System.out.println("ID:"+id+" 不存在");

    }

    public void save() {
        ObjectOutputStream objectOutputStream = null;

        try {
            objectOutputStream = new ObjectOutputStream(
                    new FileOutputStream("C:\\Users\\Lenovo\\IdeaProjects\\通讯录系统\\src\\data.txt"));
            objectOutputStream.writeObject(contaxts);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                objectOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void init(){

        ObjectInputStream objectInputStream = null;

        try {
            objectInputStream = new ObjectInputStream( new FileInputStream("C:\\Users\\Lenovo\\IdeaProjects\\通讯录系统\\src\\data.txt"));
            ArrayList<Contaxt> data = (ArrayList<Contaxt> )objectInputStream.readObject();
            contaxts = data;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                objectInputStream.close();
            } catch (Exception e){
                e.printStackTrace();
            }
        }
    }

}

TextDemo

java
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import java.util.Scanner;

import static java.lang.System.exit;

public class TextDemo {
    public static void main(String[] args) {
        AddressBook MyBook = new AddressBook();
        MyBook.init();

        while(true)
        {
            System.out.println("1.添加联系人");
            System.out.println("2.删除联系人");
            System.out.println("3.修改联系人");
            System.out.println("4.查找联系人");
            System.out.println("5.查看所有联系人");
            System.out.println("6.退出");

            Scanner sc = new Scanner(System.in);
            int op = sc.nextInt();

            switch (op)
            {
                case 1:
                    MyBook.addContaxt();
                    break;
                case 2:
                    MyBook.deleteID();
                    break;
                case 3:
                    MyBook.changeID();
                    break;
                case 4:
                    MyBook.searchID();
                    break;
                case 5:
                    MyBook.showAll();
                    break;
                case 6:
                    System.out.println("退出");
                    System.exit(0);
                default:
                    System.out.println("输入错误");
            }
        }
    }
}