关于内置锁的可重入性
《java并发编程实践》一书中，关于synchronized内置锁的可重入的例子如下：
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public class Widget {
public synchronized void doSomething() {
...
}
}
public class LoggingWidget extends Widget {
public synchronized void doSomething() {
System.out.println(toString() + ": calling doSomething");
super.doSomething();//若内置锁是不可重入的，则发生死锁
}
}
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小弟在此次有两点疑惑：
1、LoggingWidget 的对象调用doSomething方法时，锁对象为LoggingWidget对象
super.doSomething()调用是锁对象是谁？LoggingWidget对象 还是 Widget 的Class对象？
运行程序，查看thread dump发现：调用super.doSomething()时锁对象依然是LoggingWidget对象。
"线程#1" prio=6 tid=0x0bd60400 nid=0x16f8 waiting on condition [0x0bf8f000..0x0bf8fd68]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at Widget.doSomething(Widget.java:4)
- locked <0x03fbc150> (a LoggingWidget)
at LoggingWidget.doSomething(LoggingWidget.java:5)
- locked <0x03fbc150> (a LoggingWidget)
at LoggingWidget$1.run(LoggingWidget.java:15)
Locked ownable synchronizers:
- None
2、在网上搜索发现，大伙都如是说：
