Influence of synchronized method on non synchronized method

StringBuilder is a thread unsafe class.

StringBuffer is thread safe because its methods are synchronized.

Today, I wrote a piece of code to test it: start 10 threads with a loop, call the append of StringBuffer (StringBuilder), and append 1 to 10.

The result is expected to be the same: the thread unsafe StringBuilder will miss some numbers,

@H_ 404_ 13@

All 10 numbers are appended to the thread safe StringBuffer:

@H_ 404_ 13@

At this time: if I operate the builder and buffer at the same time and call the append of the buffer first, the builder method is changed into a "synchronous" method because the buffer blocks the thread because the builder and buffer are in the same thread every time, and 10 numbers are also appended

@H_ 404_ 13@

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