Shulou(Shulou.com)06/01 Report--

How to achieve SpringBuilder and StringBuffer source code parsing, in view of this problem, this article introduces the corresponding analysis and solutions in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Both StringBuilder and StringBuffer inherit from AbstractStringBuilder, except that StringBuffer is thread-safe and uses the synchronized keyword synchronization method.

Both StringBuilder and StringBuffer operate on the char array in the AbstractStringBuilder class.

The default initial capacity for StringBuilder and StringBuffer is 16.

When using the append method for string concatenation, it is mainly to copy the char array, while ensuring that the capacity of the capacity meets the concatenated string size.

The ensureCapacityInternal method ensures that the current char array value is sufficient, and then copies the string to the char array value, while count adds the length of the new string.

If it's not enough, copy a new array.

The capacity of the new array will first double the current value capacity and then add 2. If it is not enough, use minCapacity. When the new capacity is returned, it will determine whether it exceeds (Integer.MAX_VALUE-8 = MAX_ARRAY_SIZE).

It's a good idea to compare the toString method, where StringBuffer's toString copies the value into a char array of toStringCache, and then new a string.

StringBuilder is simple, just new a string.

On how to achieve SpringBuilder and StringBuffer source code parsing questions to share here, I hope the above content can be of some help to you, if you still have a lot of doubts have not been solved, you can follow the industry information channel to learn more related knowledge.

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