Removing unfilled values or null values from array of String in Java

I have following String Array tmp = [null, null, null, Mars, Saturn, Mars] coming after doing the operation - allSig[d3].split(" "); where allSig is an array of Strings. The null value is empty value in the array. Now I want to remove the null. For this I am using

tmp[indexNumber] != null is not working and giving true ; taking null as the value. Even if i am using "null" as a string is not working.

How to remove this.

public static String[] removeElements(String[] allElements) {
    String[] _localAllElements = new String[allElements.length];

    for (int i = 0; i < allElements.length; i++)
        if (allElements[i] != null)
            _localAllElements[i] = allElements[i];

    return _localAllElements;
}