java string is null or empty

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Pia
04 Jul 2016
1if(str != null && !str.isEmpty()) { /* do your stuffs here */ }
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Amandine
20 Aug 2016
1/* You can use Apache Commons  */
2StringUtils.isEmpty(str)
3  
4/* which checks for empty strings and handles null gracefully. */
5  
6/*   HINT   */  
7/* the shorter and simler your code, the easier it is to test it */
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Sasha
09 Jan 2018
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}
Jessica
01 Feb 2016
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.
Juan
15 Aug 2017
1if (myString == null || myString.equals(""))
2			throw new IllegalArgumentException("empty string");
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