CODEWITHSUNDEEP
javaarraylist
Fouroh3
Fouroh3

Reputation: 542

How to you print the index or get the item of a item in an ArrayList

So I'm making a program that makes random phone numbers. I've made an ArrayList of these phone numbers and I want to be able to search through my ArrayList and find the number (if it exists) and print both the index of it and the data contained.

Here is what I've gotten so far: 

  public static ArrayList<String>phoneList = new ArrayList<String>();

  public static void main(String[] args)
  {
    Scanner s = new Scanner();

    for(int i = 0; i < 10; i++){
      phoneList.add(getPhoneNumber()); //getPhoneNumber returns a random phoneNumber
    }

    System.out.print("Enter Phone Number: ");
    String enteredNumber = s.nextLine();

    if(phoneList.containts(enteredNumber)){ 
      //tell me the index of that phone number in the list and
      //print out the phone number
    }



  }

I want to know how to do what's in the if statement.

Thanks!

Upvotes: 1

Views: 2728

Answers (2)

hasha
hasha

Reputation: 294

if(phoneList.contains(enteredNumber)
{
     int index= phoneList.indexOf(enteredNumber);
     String number = phoneList.get(index);
}

This will give the index of that Number in the list as well as Number.

Upvotes: 2

My-Name-Is
My-Name-Is

Reputation: 4940

Simply iterate through that list.

for(int i=0; i<phoneList.size(); i++){
   if(phoneList.get(i).equals(phoneNumber)){
       System.out.println("Index: "+i);
       System.out.println("PhoneNumber: "+phoneNumber);
       break;
   }
}

Upvotes: 1

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