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I have worked with String, StringBuilder and StringBuffer in java.
I thought of this question, while I was thinking from efficiency point of view.
Does “+” use in String concatenation affect efficiency?
Yes, but so little it shouldn’t matter most of the time.
Using ‘+’ for string constants is the most efficient as the compiler can perform the concatenation.
If you are joining two Strings, the
concatmethod is the most efficient as it avoids using a StringBuilder.There is almost never a good reason to use StringBuffer except for backward compatibility. StringBuilder or StringWriter are a better choice. However, it is still used explicitly more often than StringBuilder in the JDK 😛
StringBuffer is dead, long live StringBuffer