了解同步(Understanding synchronized)

 鉴于此代码： 
 
public class Messager implements Runnable {            

  public static void main(String[] args) {   
      new Thread(new Messager("Wallace")).start();    
      new Thread(new Messager("Gromit")).start();             
  }             
  private String name;                 
  public Messager(String name) { this.name = name; }             
  public void run() {    
      message(1); message(2);    
  }           
  private synchronized void message(int n) {    
    System.out.print(name + "-" + n + " ");    
  }    
}
 
 我知道synchronized关键字使线程依赖于对象的锁。 问题： 
 
 a）一旦标记为synchronized的方法完成，锁就会被释放吗？ 或者一旦线程的run()方法完成b）我可以确保任何一个线程将打印其名称并且1 2先于另一个线程打印吗？ 

Given this code: 
 
public class Messager implements Runnable {            

  public static void main(String[] args) {   
      new Thread(new Messager("Wallace")).start();    
      new Thread(new Messager("Gromit")).start();             
  }             
  private String name;                 
  public Messager(String name) { this.name = name; }             
  public void run() {    
      message(1); message(2);    
  }           
  private synchronized void message(int n) {    
    System.out.print(name + "-" + n + " ");    
  }    
}
 
I understand that the synchronized keyword makes the thread dependent on the object's lock. Questions:
 
a) Is the lock released as soon as the method marked as synchronized finishes? Or as soon as the thread's run() method finishes b) Can I ensure that any one of the threads will print its name and 1 2 before the other?

原文：https://stackoverflow.com/questions/1897295