Fork/Join Thread Pool Framework: A Powerful Tool for Task — splitting Computation!

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Starting from JDK 1.7, a new Fork/Join thread pool framework was introduced. It can split a large task into multiple smaller tasks to be executed in parallel and finally aggregate the execution results.

For example, if you want to calculate the sum of an array currently, the simplest way is to complete it in one thread using a loop. However, when the array is extremely large, the execution efficiency of this method will be relatively poor, as shown in the following sample code.

long sum = 0;
for (int i = 0; i < array.length; i++) {
    sum += array[i];
}
System.out.println("result: " + sum);

There is another way, which is to split the array. For example, divide it into 4 parts and execute them in parallel with 4 threads. Each part is calculated separately, and finally the results are aggregated. In this way, the execution efficiency will be significantly improved.