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;    }   } }}