CODEWITHSUNDEEP
java
Liam W
Liam W

Reputation: 1163

How to check if a String[] index exists?

I have a String[] and I would like to check if an index exists in it (such as String[3]).

How can I go about doing this?

Upvotes: 2

Views: 7889

Answers (4)

Govind Balaji
Govind Balaji

Reputation: 639

public boolean DoesIndexExists(String []arr, int index){
   if( arr != null && index >= 0 && index < arr.length &&  )
       return true;

   return false;
}

Upvotes: 0

Subhrajyoti Majumder
Subhrajyoti Majumder

Reputation: 41200

public boolean indexExists(String[] array,int index){
    if(array!=null && index >= 0 && index < array.length)
        return true;
    else 
       return false;
}

Upvotes: 4

NPE
NPE

Reputation: 500367

if (arr != null && i >= 0 && i < arr.length) {
  // arr[i] exists
}

If arr is an array of objects, you may also need to check whether arr[i] is null:

if (arr != null && i >= 0 && i < arr.length && arr[i] != null) {
  // arr[i] exists and is not null
}

Upvotes: 12

Juvanis
Juvanis

Reputation: 25950

An existing index doesn't necessarily mean a non-null array entry, be careful. 

String[] array = ...
int index = 3;

if(array.length > index && index >= 0)
  // it exists.

Upvotes: 4

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