A practice to ensure threads finish a required method before another thread starts is to use the synchronized keyword in the method header.
This is known to be the act of giving room for only a single thread to be able to access the shared data or resource at a given timeframe.
Note that it often help users to be able to protect their data from being access by different threads and as such, a practice to ensure threads finish a required method before another thread starts is to use the synchronized keyword in the method header.
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