How will you improve the performance of an application by multi-threading in Java?

In an environment with more than one CPU, we can parallelize the computation tasks on multiple CPUs. This leads to parallel processing of a bigger task that takes lesser time due to multiple threads dividing the work among themselves. One example is that if we have to process 1000 data files and calculate the sum of numbers in each file. If each file takes 5 minutes, then 1000 files will take 5000 minutes for processing.

But by using multi-threading we can process these files in 10 parallel threads. So each thread will take 100 files each. Since now work is happening in 10 parallel threads, the time taken will be around 500 minutes.

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