Java Modifier isNative(mod)方法及实例

java.lang.reflect.Modifier 的 isNative(mod) 方法用于检查整数参数是否包括本地修改器。如果这个整数参数代表本地类型的修改器，那么该方法返回true，否则返回false。

语法

public static boolean isNative(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 ：如果修改器包括本地修改器，该方法返回真，否则返回假。

下面的程序说明了isNative()方法：

程序1 :

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

输出。

Mod integer value 17 is native : false

程序2

// Java program to illustrate isNative()  import java.lang.reflect.*;  public class GFG {      public static void main(String[] args)    {          // get Method class object        Method[] methods            = Numbers.class.getMethods();          // get Modifier Integer value        int mod1 = methods[0].getModifiers();        int mod2 = methods[1].getModifiers();          // check Modifiers are native or not        boolean result1 = Modifier.isNative(mod1);        boolean result2 = Modifier.isNative(mod2);          // print results        System.out.println("Mod integer value "                           + mod1 + " for method "                           + methods[0].getName()                           + " is native : "                           + result1);          System.out.println("Mod integer value "                           + mod2 + " for method"                           + methods[1].getName()                           + " is native : "                           + result2);    }      // sample native class    abstract class Numbers {          abstract public int initializeNumber();        int declareNumbers()        {            return 0;        }    }}

输出。

Mod integer value 1025 for method initializeNumber is native : falseMod integer value 17 for methodwait is native : false

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