区别:
非静态方法是获取对象锁(如this)
静态方法是获取类锁 (如:Demo.class)
public class StaticSynDemo {
private static String a="test";
//等同于方法print2
public synchronized void print1(String b){ //调用前要取得StaticSynDemo实例化后对象的锁
System.out.println(b+a);
}
public void print2(String b){
synchronized (this) {//取得StaticSynDemo实例化后对象的锁
System.out.println(b+a);
}
}
//等同于方法print4
public synchronized static void print3(String b){//调用前要取得StaticSynDemo.class类的锁
System.out.println(b+a);
}
public static void print4(String b){
synchronized (StaticSynDemo.class) { //取得StaticSynDemo.class类的锁
System.out.println(b+a);
}
}
}