java.lang.reflect.Modifier Class in Java (original) (raw)
Last Updated : 09 Mar, 2021
The java.lang.reflect.Modifier class contains methods used to get information about class, member and method access modifiers. The modifiers are represented as int value with set bits at distinct positions. The int value represents different modifiers. These values are taken from the tables in sections 4.1, 4.4, 4.5, and 4.7 of The JVM Specification.
Class declaration:
Public class modifier extends Object
Fields:
| Field | Description |
|---|---|
| ABSTRACT | Integer value representing the abstract modifier. |
| FINAL | Integer value representing the final modifier. |
| INTERFACE | Integer value representing the interface modifier. |
| NATIVE | Integer value representing the native modifier. |
| PRIVATE | Integer value representing the private modifier. |
| PROTECTED | Integer value representing the protected modifier. |
| PUBLIC | Integer value representing the public modifier. |
| STATIC | Integer value representing the static modifier. |
| STRICT | Integer value representing the strictfp modifier. |
| SYNCHRONIZED | Integer value representing the synchronized modifier. |
| TRANSIENT | Integer value representing the transient modifier. |
| VOLATILE | Integer value representing the volatile modifier. |
Constructor:
public Modifier(): Default constructor
Methods:
| Method | Description |
|---|---|
| classModifiers() | This method returns an int value OR-ing together the source language modifiers that can be applied to a class. |
| constructorModifiers() | This method returns an int value OR-ing together the source language modifiers that can be applied to a constructor. |
| fieldModifiers() | This method returns an int value OR-ing together the source language modifiers that can be applied to a field. |
| interfaceModifiers() | This method returns an int value OR-ing together the source language modifiers that can be applied to an interface. |
| isAbstract(int mod) | This method returns true if the integer argument includes the abstract modifier, false otherwise. |
| isFinal(int mod) | This method returns true if the integer argument includes the final modifier, false otherwise. |
| isInterface(int mod) | This method returns true if the integer argument includes the interface modifier, false otherwise. |
| isNative(int mod) | This method returns true if the integer argument includes the native modifier, false otherwise. |
| isPrivate(int mod) | This method returns true if the integer argument includes the private modifier, false otherwise. |
| isProtected(int mod) | This method returns true if the integer argument includes the protected modifier, false otherwise. |
| isPublic(int mod) | This method returns true if the integer argument includes the public modifier, false otherwise. |
| isStatic(int mod) | This method returns true if the integer argument includes the staticfp modifier, false otherwise. |
| isSynchronized(int mod) | This method returns true if the integer argument includes the synchronized modifier, false otherwise. |
| isTransient(int mod) | This method returns true if the integer argument includes the transient modifier, false otherwise. |
| isVolatile(int mod) | This method returns true if the integer argument includes the volatile modifier, false otherwise. |
| methodModifiers() | This method returns an int value OR-ing together the source language modifiers that can be applied to a method. |
| parameterModifiers() | This method returns an int value OR-ing together the source language modifiers that can be applied to a parameter. |
| toString(int mod) | This method returns a string describing the access modifier flags in the specified modifier. |
1. static int classModifiers():
This method returns an int value after performing OR operation on the access modifiers that can be applied to a class.
Return type: Integer
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String[] args)
`` {
`` System.out.println(Modifier.classModifiers());
`` System.out.println(
`` Modifier.toString(Modifier.classModifiers()));
`` }
}
Output
3103 public protected private abstract static final strictfp
2. static int constructorModifiers(); Returns an int value after performing OR operation on the access modifiers that can be applied to a constructor.
Return type: Integer
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String[] args)
`` {
`` System.out.println(Modifier.constructorModifiers());
`` System.out.println(Modifier.toString(
`` Modifier.constructorModifiers()));
`` }
}
Output
7 public protected private
3. static int fieldModifiers(): Returns an int value after performing OR operation on the access modifiers that can be applied to a field.
Return type: Integer
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String[] args)
`` {
`` System.out.println(Modifier.fieldModifiers());
`` System.out.println(Modifier.toString(
`` Modifier.fieldModifiers()));
`` }
}
Output
223 public protected private static final transient volatile
4. static int interfaceModifiers(): Returns an int value after performing OR operation on the access modifiers that can be applied to an interface.
Return type: Integer
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String[] args)
`` {
`` System.out.println(Modifier.interfaceModifiers());
`` System.out.println(Modifier.toString(
`` Modifier.interfaceModifiers()));
`` }
}
Output
3087 public protected private abstract static strictfp
6. static boolean isAbstract(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isAbstract(
`` demoClass. class .getModifiers()));
`` }
`` abstract class demoClass {
`` }
}
7. static boolean isFinal(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isFinal(
`` demoClass. class .getModifiers()));
`` }
`` final class demoClass {
`` }
}
8. static boolean isInterface(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isInterface(
`` demoInterface. class .getModifiers()));
`` }
`` interface demoInterface {
`` String demoMethod();
`` }
}
9. static boolean isNative(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class GFG0 {
`` public static void main(String args[])
`` {
`` Method methods[] = demoClass. class .getMethods();
`` System.out.println(
`` Modifier.isNative(methods[ 0 ].getModifiers()));
`` }
`` static class demoClass {
`` public static String demoField;
`` public final native String getDemoField();
`` }
}
10. static boolean isPrivate(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isPrivate(
`` demoClass. class .getModifiers()));
`` }
`` private class demoClass {
`` }
}
11. static boolean isProtected(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isProtected(
`` demoClass. class .getModifiers()));
`` }
`` protected class demoClass {
`` }
}
12. static boolean isPublic(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isPublic(
`` demoClass. class .getModifiers()));
`` }
`` public class demoClass {
`` }
}
13. static boolean isStatic(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` System.out.println(Modifier.isStatic(
`` demoClass. class .getModifiers()));
`` }
`` static class demoClass {
`` }
}
14. static boolean isStrict(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` Method methods[] = demoClass. class .getMethods();
`` System.out.println(
`` Modifier.isStrict(methods[ 0 ].getModifiers()));
`` }
`` static class demoClass {
`` public static String demoField;
`` public final native String getDemoField();
`` }
}
15. static boolean isSynchronized(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[])
`` {
`` Method methods[] = demoClass. class .getMethods();
`` System.out.println(Modifier.isSynchronized(
`` methods[ 0 ].getModifiers()));
`` }
`` static class demoClass {
`` public static String demoField;
`` public final synchronized String getDemoField()
`` {
`` return demoField;
`` }
`` }
}
16. static boolean isTransient(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[]) throws Exception
`` {
`` Field field
`` = demoClass. class .getDeclaredField( "demoField" );
`` System.out.println(
`` Modifier.isTransient(field.getModifiers()));
`` }
`` static class demoClass {
`` public transient String demoField;
`` public final native String getDemoField();
`` }
}
17. static boolean isVolatile(): Checks whether the integer argument includes the abstract modifier.
Return type: boolean
Java
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
public class GFG {
`` public static void main(String args[]) throws Exception
`` {
`` Field field
`` = demoClass. class .getDeclaredField( "demoField" );
`` System.out.println(
`` Modifier.isVolatile(field.getModifiers()));
`` }
`` static class demoClass {
`` public volatile String demoField;
`` public final native String getDemoField();
`` }
}
18. static int methodModifiers(): Returns an int value after performing OR operation on the values of access modifiers that can be applied to a method.
Return type: Integer
Java
import java.lang.reflect.Modifier;
public class modifier {
`` public static void main(String[] args)
`` {
`` System.out.println(Modifier.methodModifiers());
`` }
}