如何在Java中使用多线程来并行化for循环？

import java.util.ArrayList;
import java.util.List;

class MyThread implements Runnable {
    private List<Integer> resultList;
    private int start;
    private int end;

    public MyThread(List<Integer> resultList, int start, int end) {
        this.resultList = resultList;
        this.start = start;
        this.end = end;
    }

    @Override
    public void run() {
        for (int i = start; i <= end; i++) {
            // 执行任务逻辑，这里以计算平方和为例
            int square = i * i;
            
            // 将任务结果添加到结果列表中
            synchronized(resultList) {
                resultList.add(square);
            }
        }
    }
}

public class ParallelForLoop {
    public static void main(String[] args) throws InterruptedException {
        int numThreads = 4;
        int start = 1;
        int end = 100;
        
        List<Integer> resultList = new ArrayList<>();
        List<Thread> threads = new ArrayList<>();
        
        // 计算每个线程需要处理的数据范围
        int step = (end - start + 1) / numThreads;
        
        // 创建并启动多个线程
        for (int i = 0; i < numThreads; i++) {
            int threadStart = start + i * step;
            int threadEnd = i == numThreads - 1 ? end : threadStart + step - 1;
            
            Thread thread = new Thread(new MyThread(resultList, threadStart, threadEnd));
            threads.add(thread);
            thread.start();
        }
        
        // 等待所有线程执行完毕
        for (Thread thread : threads) {
            thread.join();
        }
        
        // 处理线程的执行结果
        int sum = 0;
        for (int result : resultList) {
            sum += result;
        }
        
        System.out.println("Sum of squares: " + sum);
    }
}