What is the difference between String and StringBuffer in Java?
Is there a maximum size for String?
String is used to manipulate character strings that cannot be changed (read-only and immutable).
StringBuffer is used to represent characters that can be modified.
StringBuffer is faster when performing concatenations. This is because when you concatenate a
String, you are creating a new object (internally) every time since
String is immutable.
You can also use
StringBuilder which is similar to
StringBuffer except it is not synchronized. The maximum size for either of these is
Integer.MAX_VALUE (231 - 1 = 2,147,483,647) or maximum heap size divided by 2 (see how many characters can a Java string have?).
More information here.