Java Long class

Java Class getDeclaredConstructors() Method

Last Updated : 17 Mar 2025

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

Syntax

Parameter

Returns

An array of constructor object.

Throws

SecurityException

Example 1

import java.lang.reflect.*;
public class ClassgetDeclaredConstructorsExample1 {
   public static void main(String[] args) {
      ClassgetDeclaredConstructorsExample1  obj = new ClassgetDeclaredConstructorsExample1();
      Class cls = obj.getClass();

      Constructor[] cnstrct = cls.getDeclaredConstructors();
      for(int i = 0; i < cnstrct.length; i++) {
         System.out.println("Constructor  : " +(i+1)+ " =  " + cnstrct[i].toString());
      }
   }

   private ClassgetDeclaredConstructorsExample1() {
      System.out.println("no argument constructor");
   }

   public ClassgetDeclaredConstructorsExample1(Double dbl, Long lng) {
      this.dbl = dbl;
      this.lng = lng;
   }
   Double dbl = new Double(3.9d);
   Long lng = new Long(7687);
} 

Output:

no argument constructor
Constructor  : 1 =  private ClassgetDeclaredConstructorsExample1()
Constructor  : 2 =  public ClassgetDeclaredConstructorsExample1(java.lang.Double,java.lang.Long)

Example 2

import java.lang.reflect.Constructor;
import java.util.Arrays;

public class ClassgetDeclaredConstructorsExample2 {
    public ClassgetDeclaredConstructorsExample2 () {
    }

    public ClassgetDeclaredConstructorsExample2(int intgr) {
    }

    private ClassgetDeclaredConstructorsExample2(String str) {
    }

    public static void main(String... args) {
        Constructor<?>[] constrct = ClassgetDeclaredConstructorsExample2.class.getDeclaredConstructors();
        Arrays.stream(constrct).forEach(System.out::println);

    }
}

Output:

private ClassgetDeclaredConstructorsExample2(java.lang.String)
public ClassgetDeclaredConstructorsExample2(int)
public ClassgetDeclaredConstructorsExample2()

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Java Class getDeclaredConstructors() Method

Syntax

Parameter

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Example 1

Example 2

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Java Class getDeclaredConstructors() Method

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Example 1

Example 2

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