Java Class getDeclaredFields() Method

The getDeclaredFields() method of java Class class returns an array of field objects representing all the fields defined in this class object. If no filed is declared, then it returns an array of length 0.

Syntax

Parameter

Returns

An array of field object.

Throws

Security Exception

Example 1

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

public class ClassgetDeclaredFieldsExample1 {

   public static void main(String[] args) {

      try {            
         ClassgetDeclaredFieldsExample1 obj = new ClassgetDeclaredFieldsExample1();
         Class class1 = obj.getClass();
       
         Field[] getfields = class1.getDeclaredFields();
         for(int i = 0; i < getfields.length; i++) {
            System.out.println("Field (" +(i+1)+ ")" + getfields[i].toString()); //get the field and convert into string
         }
      } catch(Exception e) {
         System.out.println(e.toString()); //print the exceptio object e
      }
   }

   public ClassgetDeclaredFieldsExample1() {
      // Default Constructor
   }

   public ClassgetDeclaredFieldsExample1(long l, int i , String p) {
       //parameterized constructor with 3 parameter
      this.l = l;
      this.i = i;
      this.p = p;
   }

   long l = 66788;
   int i = 8;
   String p = "javaTpoint";
}

Test it Now

Output:

Field (1)long ClassgetDeclaredFieldsExample1.l
Field (2)int ClassgetDeclaredFieldsExample1.i
Field (3)java.lang.String ClassgetDeclaredFieldsExample1.p

Example 2

//import statements
import java.lang.reflect.*;
public class ClassgetDeclaredFieldsExample2 {

   public static void main(String[] args) {
      try {            
          ClassgetDeclaredFieldsExample2 obj = new ClassgetDeclaredFieldsExample2(23);
         Class class1 = obj.getClass();
       
         Field[] getfields = class1.getDeclaredFields();
         for(int i = 0; i < getfields.length; i++) {
            System.out.println("Field (" +(i+1)+ ")" + getfields[i].toString()); //get the field and convert into string
         }
      } catch(Exception e) {
         System.out.println(e.toString()); //print the exceptio object e
      }
   }
 public ClassgetDeclaredFieldsExample2(int i) {
      // Default Constructor
      this.i=i;
   }
   public ClassgetDeclaredFieldsExample2(long l, int i , String p , float f , boolean b) {
       //parameterized constructor with 3 parameter
      this.l = l;
      this.i = i;
      this.p = p;
      this.f = f;
      this.b = b;
   }
   long l = 66788;
   int i = 8;
   String p = "javaTpoint";
   float f =  9 ;
   boolean b = true;
}

Test it Now

Output:

Field (1)long ClassgetDeclaredFieldsExample2.l
Field (2)int ClassgetDeclaredFieldsExample2.i
Field (3)java.lang.String ClassgetDeclaredFieldsExample2.p
Field (4)float ClassgetDeclaredFieldsExample2.f
Field (5)boolean ClassgetDeclaredFieldsExample2.b

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