在Groovy中并发运行FOR循环？

import java.util.concurrent.*

def concurrentForLoop(start, end, threads) {
    def threadPool = Executors.newFixedThreadPool(threads)
    def step = (end - start) / threads

    (0..<threads).each { i ->
        def threadStart = start + i * step
        def threadEnd = (i == threads - 1) ? end : threadStart + step - 1
        threadPool.execute {
            for (int j = threadStart; j <= threadEnd; j++) {
                // TODO: 执行FOR循环中的操作
            }
        }
    }

    threadPool.shutdown()
    threadPool.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS)
}

// 示例调用
concurrentForLoop(1, 100, 4)