empCodeKeyAndLineValueMapcomputeIfAbsentempCode k - new ArrayListaddlineNum; 换成bigfunction

To replace the computeIfAbsent method with bigFunction in the code snippet, you can modify it as follows:

empCodeKeyAndLineValueMap.computeIfAbsent(empCode, k -> {
    List<Integer> lineValues = new ArrayList<>();
    bigFunction(k, lineValues);
    return lineValues;
});

In this case, bigFunction is a method that takes two parameters: the empCode and a List<Integer> to store the line values. The bigFunction is responsible for populating the line values list based on the empCode