Java Class getConstructors() Method

The getConstructors() method of java Class class returns an array which contains the constructor object reflected by the public constructors of this class. If no constructor is defined, it returns an array of length 0.

Syntax

Parameter

Returns

An array of all the constructor.

Throws

SecurityException

Example 1

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

public class ClassgetConstructorsExample1 {

   public static void main(String[] args) {

      try {
         Class clsfrm = Class.forName("java.awt.Frame");  //take class path as parameter
         System.out.println("Frame Constructors::"); //print statement

         Constructor cls[] = clsfrm.getConstructors(); 
         for(int i = 0; i < cls.length; i++) {   //loop from I to length 
            System.out.println("Constructor  "+ (i+1) +  "::  " +cls[i]);
         }
      } catch (Exception e) {
         System.out.println("Exception: " + e); //printing exception object
      }
   }
} 

Test it Now

Output:

Frame Constructors::
Constructor  1::  public java.awt.Frame(java.lang.String,java.awt.GraphicsConfiguration)
Constructor  2::  public java.awt.Frame(java.lang.String) throws java.awt.HeadlessException
Constructor  3::  public java.awt.Frame(java.awt.GraphicsConfiguration)
Constructor  4::  public java.awt.Frame() throws java.awt.HeadlessException

Example 2

//import statements
import java.lang.reflect.Constructor; //import constructor
import java.math.BigInteger; //import math package
import java.util.Arrays;

public class ClassgetConstructorsExample2  {

    public static void main(String... args) {
        Constructor<?>[] cnstrctr = Class1.class.getConstructors(); //getconstructors method
        Arrays.stream(cnstrctr).forEach(System.out::println);
    }

    private static class Class1 {
        public Class1() {
        }

        public Class1(int x) {
        }

        public Class1(String s, BigInteger[] integers) { //constructor with 2 parameter
        }
    }
}

Test it Now

Output:

public ClassgetConstructorsExample2$Class1()
public ClassgetConstructorsExample2$Class1(int)
public ClassgetConstructorsExample2$Class1(java.lang.String,java.math.BigInteger[])

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