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This article introduces what are the expansion rules of StringBuilder, the content is very detailed, interested friends can refer to, I hope it can be helpful to you.

The default size of the char array opened by StringBuilder when it is created

StringBuilder () default 16

StringBuilder ("Str") default Str.length () + 16

Rules for StringBuilder sb expansion:

The current capacity is judged each time when sb.append () is called

Determine whether the minimum capacity required (the length of the data already stored + the length of the data to be stored) is greater than the length of the stored char array. If so, expand the capacity in newCapacity.

Determine whether the length of 2 times + 2 of the current char array length meets the needs of capacity expansion, does not meet the length of data set to be stored + the length of data to be stored, and determines whether append expansion exceeds MAX_ARRAY_SIZE (Integer.MAX_VALUE-8). If an exception OutOfMemoryError is thrown

What are the rules of StringBuilder expansion to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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