Very precisely
if(k!=null && k.length>0){
System.out.println(k.length);
}else
System.out.println("Array is not initialized or empty");
k!=null would check array is not null. And StringArray#length>0 would return it is not empty[you can also trim before check length which discard white spaces].
Some related popular question -
- What is null in java?
- Avoiding “!= null” statements in Java?
