看一段测试代码：
package com.wenniuwuren.concurrent;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Created by zhuyb on 16/6/16.
*/
public class newCachedThreadPoolTest {
public static void main(String[] args) {
ExecutorService executorService = Executors.newCachedThreadPool();
for (int i = 1; i < 10000; i++)
executorService.submit(new task());
}
}
class task implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}运行结果为：
Exception in thread "main" java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:714)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:950)
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1368)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112)
at com.wenniuwuren.concurrent.newCachedThreadPoolTest.main(newCachedThreadPoolTest.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
总结一下：所以这个 newCachedThreadPool 大家一般不用就是这样的原因，因为它的最大值是在初始化的时候设置为 Integer.MAX_VALUE，一般来说机器都没那么大内存给它不断使用。当然知道可能出问题的点，就可以去重写一个方法限制一下这个最大值，但是出于后期维护原因，一般来说用 newFixedThreadPool 也就足够了。
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