String is immutable — every operation creates a new object. Repeated concatenation produces many temporary objects and unnecessary GC pressure. StringBuilder and StringBuffer solve this: they are mutable, operate on an internal character array, and produce no intermediate strings.
The Problem with Repeated Concatenation
Full content is available with a subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.