I am using String.split() to split a string. The string I receive has this structure:
[data]<US>[data]<US>
where <US> is the ASCII unit separator (code 0x1F). The code to split is
String[] fields = someString.split(String.valueOf(0x1f));
This works fine, unless [DATA] is an empty string. In that case, data just gets skipped.
I want a string like [DATA]<US><US>[DATA]<US> to return an array with three elements: [DATA], null and [DATA].
How can I do that?
If you parametrize your split with -1 as a second argument, you'll get an empty String where [data] is missing (but not null).
someString.split(String.valueOf(0x1f), -1);
Explanation from the docs
If n is non-positive then the pattern will be applied as many times as possible and the array can have any length.
.. where n is the limit, i.e. the second argument.
You could simply loop through the array afterwards and assign empty strings as null:
public class StringSplitting {
public static void main(String[] args){
String inputs = "[data]<US><US>[data]<US>";
String[] fields = inputs.split("<US>");
//set empty values to null
for(int i = 0; i < fields.length; i++){
if(fields[i].length() == 0){
fields[i] = null;
}
}
//print output
for(String e: fields){
if(e == null){
System.out.println("null");
}else{
System.out.println(e);
}
}
}
}
This is a working code
String s="[DATA]<US><US>[DATA]<US>";
String arr []= s.split("<US>");
for(String str :arr) {
if(str.equals("")) {
System.out.println("null");
} else {
System.out.println(str);
}
}
Output::
[DATA]
null
[DATA]
To be more specific as per your requirement:
public String [] format(String s) {
String arr []= s.split("<US>");
for(int i=0;i<arr.length;i++)
{
if(arr[i].equals(""))
{
arr[i]=null;
}
}
return arr;
}
