查看对象头，观察对象锁的状态
查看对象头，观察对象锁的状态
<dependency>
<groupId>org.openjdk.jol</groupId>
<artifactId>jol-core</artifactId>
<version>0.9</version>
</dependency>
package comg.yang.httpstest.controller;
import org.openjdk.jol.info.ClassLayout;
import java.util.concurrent.TimeUnit;
/**
* @description:
* @author: Yang JianXiong
* @since: 2023/9/5
*/
public class BiasLockTest {
public static void main(String[] args) throws InterruptedException {
TimeUnit.SECONDS.sleep(2);
Object lock = new Object();
System.err.println(ClassLayout.parseInstance(lock).toPrintable());
extracted(lock);
System.err.println(ClassLayout.parseInstance(lock).toPrintable());
}
private static void extracted(Object lock) {
synchronized (lock) {
System.out.println(ClassLayout.parseInstance(lock).toPrintable());
}
}
}
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