开不了
可以从源码中看出来,首先写一个简单的测试类
public class Test01 {
public static void main(String[] args) {
new Thread().start();
}
}
然后Ctrl+左键进入start方法
public synchronized void start() {
/**
* This method is not invoked for the main method thread or "system"
* group threads created/set up by the VM. Any new functionality added
* to this method in the future may have to also be added to the VM.
*
* A zero status value corresponds to state "NEW".
*/
if (threadStatus != 0)
throw new IllegalThreadStateException();
/* Notify the group that this thread is about to be started
* so that it can be added to the group's list of threads
* and the group's unstarted count can be decremented. */
group.add(this);
boolean started = false;
try {
start0();
started = true;
} finally {
try {
if (!started) {
group.threadStartFailed(this);
}
} catch (Throwable ignore) {
/* do nothing. If start0 threw a Throwable then
it will be passed up the call stack */
}
}
}
private native void start0();
从源码中可以看到,start方法是把线程放到了group中,然后执行了一个start0方法。而start0方法是一个本地方法,放在本地方法库中。众所周知,本地方法库是用C++编写的。