Best way of concatenate String in java

Question

What is the best way to concatenate two Strings in java. likely best performance and less memory usage. Please help me..!

The best way is not asking this question here and make a minimal research. — Maroun, Nov 05 '14 at 08:37
I would've suggested `string1 += string2` but I can't guarantee that it has the best performance and least memory usage. — Cupple Kay, Nov 05 '14 at 09:27

score 2 · Answer 1 · answered Nov 05 '14 at 08:37

2

StringBuilder stringBuilder = new StringBuilder(firstString);
stringBuilder.append(secondString);
String string = stringBuilder.toString();

But according to @a_horse_with_no_name the following is even more efficient

StringBuilder sb = new StringBuilder(firstString.length() + secondString.length()); 
sb.append(firstString); 
sb.append(secondString);
String string = sb.toString();

answered Nov 05 '14 at 08:37

EpicPandaForce

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Thanks for the reply – Chinthana Bandara Nov 05 '14 at 08:38
2

`new StringBuilder(firstString.length() + secondString.length()); sb.append(firstString); sb.append(secondString);` should be more efficient – a_horse_with_no_name Nov 05 '14 at 08:38

Best way of concatenate String in java

1 Answers1