标签: non-thread-safe

我知道TreeMap不是线程安全的.我正在尝试将TreeMap与ConcurrentSkipListMap进行比较.我使用的代码如下所示,我想确定我得到的错误是由于TreeMap不是线程安全而不是因为其他一些.

java中java.util.TreeMap.fixAfterInsertion(TreeMap.java:2127)的java.util.TreeMap.rotateLeft(TreeMap.java:2060)中的线程"pool-1-thread-52"java.lang.NullPointerException中的异常. util.TreeMap.put(TreeMap.java:574)位于java.util.concurrent.ThreadPoolExecutor $的java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)的ThreadTestTreeMap $ 1.run(ThreadTestTreeMap.java:39) java.lang.Thread.run上的Worker.run(ThreadPoolExecutor.java:615)(Thread.java:745)

import com.google.common.collect.Ordering;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class ThreadTestTreeMap {
    public static Map<String, Object> map;
    public static int THREADS =  100;
    public static long averageTime = 0;

public static void main(String args[]) throws InterruptedException {
    for (int i = 0; i < 1; i++) {
        map = new TreeMap<>(Ordering.natural());
//            map = new ConcurrentSkipListMap<>(Ordering.natural());

        long time = System.nanoTime();
        ExecutorService service = …