java簡易通信録システム

この記録は比較的簡単で、連絡先のID、携帯番号、QQ番号、性別、住所を削除し、追加し、操作を修正することができます。
ソースコード:
 
 

​package SunPeishuai;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
/*                                                                           */
public class Tongxunlu {

       static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); 
       static String id="",name="", address="", phone="", sex="", qq="", yn="";
       static Read[] c = new Read[10];
       static int num = 0;
       
       public static void main(String[] args) {
           while(true){

                System.out.println("*****************************************");
                System.out.println("*                                                      *");
                System.out.println("*---------------------------------------*");
                System.out.println("*               1.                    *");
                System.out.println("*               2.                    *");
                System.out.println("*               3.                    *");
                System.out.println("*               4.                    *");
                System.out.println("*               5.                    *");
                System.out.println("*****************************************");
                try{
                       System.out.println("      !");
                       int s = new Scanner(System.in).nextInt();
                       switch(s){
                                  case 1:
                                           Add();
                                           break;
                                  case 2:
                                           Modify();
                                           break;
                                  case 3:
                                           Delect();
                                           break;
                                  case 4:
                                           Query();
                                           break;
                                  case 5:
                                	        System.out.println("    ");
                                	        System.exit(0);
                                	        break;
                                  default:
                                	        System.out.println("    ,     ");
                                } 
                     } catch(Exception e){                           //    
                    	 System.out.println("     1~5     ！"); 
                         } 
                 } 
        }
       /*                                      */
       public static void Add() throws IOException{ 
    	   System.out.println("   ID"); 
    	   id = in.readLine(); 
    	   System.out.println("     ");
    	   name = in.readLine(); 
    	   System.out.println("     "); 
    	   phone = in.readLine(); 
    	   System.out.println("   QQ"); 
    	   qq = in.readLine();
    	   while(true) { 
    		   System.out.println("     ");
    		   sex = in.readLine(); 
    		   if(sex.equals(" ")||sex.equals(" ")) break; 
    		   System.out.println("      ,    "); 
    		   } 
    	    System.out.println("     "); 
    		address = in.readLine();
    		System.out.println("    ,    (Y/N)");
    		yn = in.readLine();
    		if(yn.equals("Y") || yn.equals("y")) { 
    	    c[num] = new Read(id,name,phone,qq,sex,address);
    	    num++;
    	    System.out.println("    ！");
    			   }else {
           System.out.println("    ！"); 
    			   }
           } 
       /*                                        */
           public static String Delect() throws IOException { 
        	   System.out.println("         ：");
        	   name = in.readLine(); 
        	   if(num==0) {
        		   System.out.println("       ，       ！");
        	   }
        	   for(int i=0;i