How can I use Binary Search on a sorted array of string in Java?

//Updation of mobile nos. for n customers
import java.util.Scanner;
class MobileNo
{
     private long mobNo[];
     private int n;
     private String name[];
     void getInput()
     {
         Scanner sc = new Scanner(System.in);
         do
         {
             System.out.print("Enter the no. of customers: ");
             n = sc.nextInt();
         }
         while(n <= 0);
         System.out.println("Enter the customer names and mobile nos: ");
         name = new String[n];
         mobNo = new long[n];
         for(int i = 0; i < n; i++)
         {
             System.out.println("Customer - "+(i + 1)+":- ");
             if(sc.hasNextLine())
             sc.nextLine();//drains Scanner of Line Feeds
             name[i] = sc.nextLine();
             do
             {
                 mobNo[i] = sc.nextLong();
                 if(mobNo[i] < 1000000000l || mobNo[i] > 9999999999l)
                 System.out.println("Give a 10 digit no!");
             }
             while(mobNo[i] < 1000000000l || mobNo[i] > 9999999999l);
         }
     }
     void sort()
     {
         String temp;
         long tempNo;
         for (int i = 0; i < n; i++) 
         {
               for (int j = i + 1; j < n; j++) 
               {
                   if (name[i].compareTo(name[j])>0) 
                   {
                       temp = name[i];
                       tempNo = mobNo[i];
                       name[i] = name[j];
                       mobNo[i] = mobNo[j];
                       name[j] = temp;
                       mobNo[j] = tempNo;
                   }
               }
         }
         System.out.println("Names in Alphabetical Order:");
         for (int i = 0; i < n - 1; i++) 
         {
              System.out.println(name[i] + " : " + mobNo[i]);
         }
         System.out.println(name[n - 1] + " : " + mobNo[n - 1]);
     }
     void update()
     {
         //this is where I need to use a Binary Search algorithm for a sorted array of string
     }
     void display()
     {
         for(int i = 0; i < n; i++)
         {
             System.out.println(name[i] + " : " + mobNo[i]);
         }
     }
}

Select allOpen in new window

//Updation of mobile nos. for n customers(main method)
class MobileNo_main
{
    public static void main(String args[])
    {
        MobileNo update = new MobileNo();
        update.getInput();
        update.display();
        update.sort();
        update.update();
    }
}

Select allOpen in new window