How to check for empty String array including empty elements

Question

org.apache.commons.lang3.ArrayUtils provides methods to check if Array is empty, but for example for String array which has empty String elementsmeaning character "" it returns true for that isNotEmpty() method, which is correct as that method check only for null and length == 0.

Is there any other method or implementation which checks also if array has empty element ?

I could do it myself, iterate over array and manualy remove such elements of course, but I would better use any library as apache.

Any hints ?

Smutje · Accepted Answer · 2015-01-26 13:56:53Z

3

With Java 8:

final String[] strings = {"", "Hello", "World"};
final boolean containsEmptyString = Stream.of(strings)
            .anyMatch(string -> string == null || string.isEmpty());

edited Jan 26, 2015 at 13:56

answered Jan 26, 2015 at 13:51

Smutje

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5 Comments

To Kra Over a year ago

oh, its nice, but we use for now only 1.7 :(

Smutje Over a year ago

My bad, but I can only recommend to switch! :-)

To Kra Over a year ago

I would switch but in JavaEE most AS are not yet supporting 1.8 :(

Smutje Over a year ago

We switched Glassfish to Wildfly and Java 7 to 8 parallel, but are a small team so less overhead.

To Kra Over a year ago

We having IBM WAS as we are part of IBM

Viktor Mellgren · Accepted Answer · 2015-01-26 13:50:23Z

1

I think you will have to do it manually, perferrably using StringUtils.isNotBlank(str) instead of arrayUtils. So that you don't iterate twice over the array.

answered Jan 26, 2015 at 13:50

Viktor Mellgren

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Comments

To Kra · Accepted Answer · 2015-01-26 14:19:07Z

0

So manual way is maybe only solution here in Java1.6 | 1.7 :

public static boolean isEmpty(String[] array){
    for(String tmp : array){
        if(StringUtils.isNotBlank(tmp)){
            return false;
        }
    }
    return true;
}

StringUtils could be from apache, or own code checking for NULL && length ==0

answered Jan 26, 2015 at 14:19

To Kra

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