简单实现Java通讯录系统

import java.util.Scanner;
class Person
 {
  String name;
  String number;
 }
class connect
{
  Person a[];
  int number;
  public connect()
  {
   a=new Person[100];
   number=0;
  } 

  public String add(String name,String number)
  {
  if(number == "0")
  System.out.println("请先添加联系人!");
  if(this.number>99)
  return "添加失败";
  a[this.number]=new Person();
  a[this.number].name=name;
  a[this.number].number=number;
  this.number++;
  return "添加成功";
  } 

  public Person seek(String name)
  {
  if(number == 0)
  System.out.println("请先添加联系人!");
  for(int i=0;i<number;i++)
  { 
   if((a[i].name).equals(name))
   {
   System.out.println("联系人： "+a[i].name+" 电话："+a[i].number);
   return a[i];
   }
  }
  return null; 
  }

  public void look()
  {
  if(number == 0)
  System.out.println("请先添加联系人！");
  for(int i=0;i<number;i++)
  {
   System.out.println("联系人 "+a[i].name+" 电话 "+a[i].number);
  }
  }

  public String delete(String name)
  {
  if(number == 0)
  System.out.println("请先添加联系人：");
  for(int i=0;i<number;i++)
  { 
   if((a[i].name).equals(name))
   {
   a[i]=a[this.number-1];
   number=number-1;
   return "删除成功";
   }
  }
  return "删除失败";
  }
}
public class text1
{
 public static void main(String[]args)
 {
 Scanner sc=new Scanner(System.in);
 Scanner input = new Scanner(System.in);
 System.out.println("\t\t\t欢迎使用通讯录系统\n");
 System.out.println("\t\t\t1.创建用户\n\n\t\t\t2.退出\n");
 System.out.println("____________________________________________________________________\n\n");
 System.out.print("请选择相应选项：");
 int num2 = sc.nextInt(); 
 while(num2!=2)
  {
  switch (num2)
  {
  case 1:
   {
   connect c = new connect();
   System.out.println("\t\t\t1.浏览\n");System.out.println("\t\t\t2.查找\n");
   System.out.println("\t\t\t3.添加\n");System.out.println("\t\t\t4.删除\n");
   System.out.println("\t\t\t5.退出\n");System.out.println("请选择相应选项：");
   System.out.println("输入指令：");
   int num1 = input.nextInt();
   switch (num1)
   {
    case 1:c.look();break;
    case 2:
    {
    System.out.println("输入查找的名字：");
    String n1 = sc.next();c.seek(n1);
    }break;
    case 3:
    {
    System.out.println("输入要添加的人数："); 
    System.out.println("enter:");
    int s=sc.nextInt();
    for(int i=0;i<s;i++)
    {
     System.out.println("请输入第"+(i+1)+"个人的名字：");
     String name=sc.next();
     String number=sc.next();
     c.add(name,number);
    }
    }break;
    case 4:
    {
    System.out.println("输入删除的姓名：");
    String n3 = sc.next();c.delete(n3);
    }break;
    default:
    {
     System.out.println("\t\t\t谢谢您的使用\n");
     System.exit(0);
    }
    } 
   }break;
  case 2:System.out.println("\t\t\t谢谢您的使用\n");break;
  default:System.out.println("输入有误！");num2=2;
  }
  }
 }
}