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Array isEmpty

Posted on 2006-10-25
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Last Modified: 2012-06-21
Hi

I am using a normal Array not util.collections

String[] animals = { "bear", "cougar", "wolverine"};

I have two questions. How to find array is empty? How to intialize array as null(without any elements).

Thanks
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Question by:basirana
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4 Comments
 
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Accepted Solution

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Peter Kwan earned 500 total points
ID: 17804634
1. You can check whether the array is null or the array's length is zero.

e.g.
boolean isEmpty(String[] array) { return array == null || array.length == 0; }

2. To initialize array as null, just set it as null.
String[] array = null;
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Author Comment

by:basirana
ID: 17804694
But for this I need to create a method isEmpty(String[] array).
Is there anyway we can check inside if condition and find.

Thanks for ur reply.
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LVL 16

Expert Comment

by:Peter Kwan
ID: 17804752
You can just copy the condition to your if statement. Then you don't need the method.

i.e.
if (array == null || array.length == 0)
   // array is empty
else
  // array is not empty
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LVL 16

Expert Comment

by:Peter Kwan
ID: 17804764
of course you need to substitute "array" with your variable. In your example:

if (animals == null || animals.length == 0)
   // for empty case
else
  // for not empty case
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