Java实现通讯录管理系统项目

public class People {
    private String sid;
    private String name;
    private String age;
    private String address;
    private String num;
    public People(){}
    public People(String sid, String name, String age, String address, String num) {
        this.sid = sid;
        this.name = name;
        this.age = age;
        this.address = address;
        this.num=num;
    }
 
    public String getSid() {
        return sid;
    }
    public void setSid(String sid) {
        this.sid = sid;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
     public String getAge() {
        return age;
    }
     public void setAge(String age) {
        this.age = age;
    }
    public String getAddress() {
        return address;
    }
     public void setAddress(String address) {
        this.address = address;
    }
    public String getNum() {
        return num;
    }
     public void setNum(String num) {
        this.num = num;
    }

public void 菜单(){
            System.out.println("-------欢迎来到通讯录管理系统-------");
            System.out.println("1.增加联系人");
            System.out.println("2.删除联系人");
            System.out.println("3.修改联系人");
            System.out.println("4.查看所有联系人");
            System.out.println("5.退出");
            System.out.println("请选择:");
    }

@Override
    public String toString(){//重写toString方法，使其变成我们看得懂的指定的信息
        return "[姓名："+name+"，年龄："+age+",电话："+num+"，关系："+sid+"，住址："+address+"]\n";
    }
 }

public static void main(String[] args) {
        ArrayList<People> array = new ArrayList();
        while (true) {
            People s = new People();//创建对象，调用方法。
            s.菜单();
            Scanner sc1 = new Scanner(System.in);
            int d = sc1.nextInt();
            switch (d) {
                case 1: {
                    addPeople(array);
                    System.out.println("添加联系人成功");
                    break;
                }
                case 2:{
                    deletePeople(array);
                  break;
                }
                case 3:{
               revisePeople(array);
                break;
                }
                case 4:{
              checkPeople(array);
              break;
                }
                case 5:{
                    System.out.println("退出成功，谢谢使用");
                    System.exit(0);
                   break;
                }
                default:{
                    System.out.println("输入错误，请重新输入");
                }
            }
        }

public static void addPeople(ArrayList<People> array){
        Scanner sc=new Scanner(System.in);
         System.out.println("请输入姓名");
         String name=sc.nextLine();
         System.out.println("请输入电话号码");
         String num=sc.nextLine();
         System.out.println("请输入你们之间的关系");
        String sid=sc.nextLine();
         System.out.println("请输入年龄");
         String age=sc.nextLine();
         System.out.println("请输入家庭住址");
         String address=sc.nextLine();
         People s1=new People();//创建对象，调用set成员，设置成员的值
         s1.setAddress(address);
         s1.setAge(age);
         s1.setName(name);
         s1.setSid(sid);
         s1.setNum(num);
         array.add(s1);//将所有设置的变量加到集合中
     }

public static void checkPeople(ArrayList<People> array){
        if(array.isEmpty()){//isEmpty是用来判断非空的是collection接口的方法，ArrayList实现了 
        list接口，list接口继承了collection接口
            System.out.println("没有联系人信息，请先添加联系人后查看");
        }
        else{
            System.out.println(array);}//查看所有输入的信息，没有重写toString时： 
             //[controller.Student@6e0be858]
     }

public static void deletePeople(ArrayList<People> array){
        if(array.isEmpty()){
            System.out.println("没有联系人信息，请先添加联系人信息再操作");
        }
        else{
           Scanner sc=new Scanner(System.in);
            System.out.println("请输入你要删除联系人名字");
              String num=sc.nextLine();
              int sum=0;
               for(int i=0;i<array.size();i++) {
                 People stu = array.get(i);
                 //  System.out.println(stu);//stu包括了一个元素联系人的所有信(name,age...)
                  if(stu.getName().equals(num)) {
                     array.remove(i);sum++;//定义一个变量用来判断是否含有该元素
                      System.out.println("删除成功");
                  }
               }
               if(sum==0){
                   System.out.println("删除失败，该联系人信息不存在");
               }
        }
     }

public static void revisePeople(ArrayList<People> array) {
          if (array.isEmpty()) {
              System.out.println("没有联系人信息！请添加后在进行操作");
          } else {
              Scanner sc1 = new Scanner(System.in);
              System.out.println("请输入你要修改联系人的姓名");
              String name1 = sc1.nextLine();
              int sum = 0;
              for (int j = 0; j < array.size(); j++) {
                  People s2 = array.get(j);
                  if (s2.getName().equals(name1)) {
                      sum++;
                  }
              }
              if (sum == 0) {
                  System.out.println("没有匹配的姓名，重新输入");
              }else{
              Scanner sc = new Scanner(System.in);
              System.out.println("请输入新姓名");
              String name = sc.nextLine();
              System.out.println("请输入新电话码");
              String num = sc.nextLine();
              System.out.println("请输入你们之间的关系");
              String sid = sc.nextLine();
              System.out.println("请输入新年龄");
              String age = sc.nextLine();
              System.out.println("请输入新地址");
              String address = sc.nextLine();
              People s1 = new People();
              s1.setAddress(address);
              s1.setAge(age);
              s1.setName(name);
              s1.setSid(sid);
              s1.setNum(num);
              // System.out.println(s1);//s1也是一个包含联系人所有信息的元素,所以后续用array.set(i,s1)等价交换
              for (int i = 0; i < array.size(); i++) {
                  People s = array.get(i);
                  if (s.getName().equals(name1)) {
                      array.set(i, s1);//将他修改
                      System.out.println("修改成功");
                      break;
                  }
 
              }
              }
          }
 
      }