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.InterruptedException
synchronized Method: public final synchronized void java.lang.Thread.join(long, int) throws java.lang.InterruptedException
synchronized 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)