Java:如何查看代码的哪些部分运行最多？(分析)

import java.text.MessageFormat;
import java.util.concurrent.ThreadLocalRandom;

public class Main {
    public static void main(String[] args) {
        int n = 100;
        int[] values = new int[n];
        for (int i = 0; i < n; i++) {
            values[i] = ThreadLocalRandom.current().nextInt(100);
        }
        int hotspotStart = Integer.MAX_VALUE / 2;
        int hotspotEnd = Integer.MIN_VALUE / 2;

        // 在这里加入您的测试代码
        hotspotStart = 28;
        hotspotEnd = 71;

        runBenchmark(values, hotspotStart, hotspotEnd);
    }

    private static void runBenchmark(int[] values, int hotspotStart, int hotspotEnd) {
        long startTime = System.nanoTime();

        if (hotspotStart > hotspotEnd) {
            throw new IllegalArgumentException("Start time cannot be after end time");
        }

        // 在这里加入您的比较逻辑
        for (int i = hotspotStart; i <= hotspotEnd; i++) {
            values[i];
        }

        endTime = System.nanoTime();
        long elapsedTime = endTime - startTime;
        float executionTime = (float) elapsedTime / 1000000000.0f;

        MessageFormat format = new MessageFormat("%30s | %-18s | %.4f ms");
        System.out.println(format.format
                (new String[]{hotspotStart + " 至 " + hotspotEnd + " 的时间: ", hotspotStart + " 至 " + hotspotEnd + " 的执行时间: ", executionTime}));
    }

    public static class TimedObject
    {
        int start; // 标识开始时间
        boolean run; // 该标识在运行期间有效
        long time; // 本次运行的间隔（毫秒）/ 执行时间

        public TimedObject()
        {
            start = 0;
            run = false;
            time = 0;
        }
        
        public TimedObject startBenchmark(int startTime)
        {
            start = startTime;
            run = true;
            time = 0;
        
            return this;
        }

        public TimedObject finishBenchmark()
        {
            run = false;
            time = System.currentTimeMillis() - time;
            return this;
        }
    }
}