Java Modifier isSynchronized(mod)方法及示例

java.lang.reflect.Modifier 的 isSynchronized(mod) 方法用于检查整数参数是否包括同步修改器。如果这个整数参数代表同步类型的修改器，那么该方法返回true，否则返回false。

语法

public static boolean isSynchronized(int mod)

参数： 该方法接受一个整数名称，因为mod代表一组修改器。

返回 ：如果mod包括同步修改器，该方法返回true；否则返回false。

下面的程序说明了isSynchronized()方法：
程序1 :

// Java program to illustrate isSynchronized() method  import java.lang.reflect.*;  public class GFG {      public static void main(String[] args)        throws NoSuchFieldException,               SecurityException    {          // get Method class object        Method[] methods            = GFGTest.class.getMethods();          // get Modifier Integer value        int mod = methods[0].getModifiers();          // check Modifier is synchronized or not        boolean result            = Modifier.isSynchronized(mod);          System.out.println("Mod integer value "                           + mod + " is synchronized : "                           + result);    }      class GFGTest {        public synchronized String method1()        {            return null;        }    }}

输出。

Mod integer value 33 is synchronized : true

程序2

// Java program to illustrate isSynchronized()  import java.lang.reflect.*;  public class GFG {      public static void main(String[] args)        throws NoSuchFieldException,               SecurityException    {          // get Method class object        Method[] methods            = Thread.class.getMethods();          // loop through methods and        // print synchronized methods        for (int i = 0; i < methods.length; i++) {              // get Modifier Integer value            int mod = methods[i].getModifiers();              // check Modifier is synchronized or not            boolean result                = Modifier.isSynchronized(mod);              if (result) {                System.out.println("synchronized Method: "                                   + methods[i]);            }        }    }}

输出。

synchronized Method: public final synchronized void java.lang.Thread.join(long) throws java.lang.InterruptedExceptionsynchronized Method: public final synchronized void java.lang.Thread.join(long, int) throws java.lang.InterruptedExceptionsynchronized Method: public synchronized void java.lang.Thread.start()synchronized Method: public final synchronized void java.lang.Thread.stop(java.lang.Throwable)synchronized Method: public final synchronized void java.lang.Thread.setName(java.lang.String)

**参考文献: ** https://docs.oracle.com/javase/10/docs/api/java/lang/reflect/Modifier.html#isSynchronized(int)