If you need to convert an array to a string in Java, then you could look at a solution like this:
String stringArray[] = {"Hello ", " world", " this", " is", " a", " test"};
StringBuffer sb = new StringBuffer();
for(int i = 0; i < stringArray.length; i++) {
sb.append(stringArray[i]);
}
String str = sb.toString();
System.out.println(str);
Or you could do something simple like this:
String str = String.join(",", arr);