how to check null and empty string in java

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Romina
02 May 2016
1if(str != null && !str.isEmpty()) { /* do your stuffs here */ }
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Abigail
23 May 2020
1public class Null {
2 
3	public static boolean isNullOrEmpty(String str) {
4        if(str != null && !str.isEmpty())
5            return false;
6        return true;
7    }
8}
source
Frieda
27 May 2020
1if(str != null && !str.isEmpty())
2Be sure to use the parts of && in this order, because java will not proceed to evaluate the second part if the first part of && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Lisa
05 Oct 2017
1if (myString == null || myString.equals(""))
2			throw new IllegalArgumentException("empty string");
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