Java Class getDeclaredField() Method

The getDeclaredField() method of java Class class returns a field object representing the specified field declared inside the class or interface of this class.

Syntax

public Field getDeclaredField(String name) throws NoSuchFieldException,
SecurityException

Parameter

name - the name of the field

Returns

Field object.

Throws

NoSuchMethodException , SecurityException

Example 1

import java.lang.reflect.*;
public class ClassgetDeclaredFieldExample1 {
   public static void main(String[] args) {
     try {            
         ClassgetDeclaredFieldExample1 obj = new ClassgetDeclaredFieldExample1();
         Class cls = obj.getClass();

         Field fval  = cls.getDeclaredField("lng");
         System.out.println("Field = " + fval.toString());
      } catch(Exception e) {
         System.out.println(e.toString());
      }
   }
   public ClassgetDeclaredFieldExample1() {      
   }

   public ClassgetDeclaredFieldExample1(long lng) {
      this.lng = lng;
   }

   long lng = 5555;
}

Test it Now

Output:

Field = long ClassgetDeclaredFieldExample1.lng

Example 2

//import statements....
import java.lang.reflect.Field;

public class ClassgetDeclaredFieldExample2 {
    private int intgr;
    public String str;

    public static void main(String... args) throws NoSuchFieldException {
        Class<ClassgetDeclaredFieldExample2> cls = ClassgetDeclaredFieldExample2.class;
        Field fld = cls.getDeclaredField("intgr");
        System.out.println(fld);

        fld = cls.getDeclaredField("str");
        System.out.println(fld);
    }
}

Test it Now

Output:

private int ClassgetDeclaredFieldExample2.intgr
public java.lang.String ClassgetDeclaredFieldExample2.str

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