Question

I have big string array and on every index I have a letter. I need to make a recall from this array and compose all this letters to one word/string. How would I do that in java?

String[] letters;
int lettersToRecall =16;
String word;
for(int i=0; i<lettersToRecall; i++){
//accumm letters into String Word..
}

Answer 1

This most straightforward method is to add all strings together:

String word = "";
for(int i = 0; i < lettersToRecall; i++){
    word += letters[i];
}

This method (simply adding String objects) wastes lots of String instances as each addition result in a new instance.

So, if you are concerned with resource usage you could use StringBuilder instead:

StringBuilder builder = new StringBuilder();
for(int i = 0; i < lettersToRecall; i++){
    builder.append(letters[i]);
}
String word = builder.toString();

For more information check when to use StringBuilder in java