Copy String array and remove empty strings

Try this,

b = Arrays.copyOf(a, a.length);

Or

b = new int[a.length];
System.arraycopy(a, 0, b, 0, b.length);

Or

b = a.clone();

You are copying the same length array and using the same indexes. The length is always going to be the same.

List<String> nonBlank = new ArrayList<String>();
for(String s: str) {
    if (!s.trim().isEmpty()) {
        nonBlank.add(s);
    }
}
// nonBlank will have all the elements which contain some characters.
String[] strArr = (String[]) nonBlank.toArray( new String[nonBlank.size()] );