Java.lang.Class.getConstructor() Method

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Description

The java.lang.Class.getConstructor() method returns a Constructor object that reflects the specified public constructor of the class represented by this Class object. The parameterTypes parameter is an array of Class objects that identify the constructor's formal parameter types, in declared order.

Declaration

Following is the declaration for java.lang.Class.getConstructor() method

public Constructor<T> getConstructor(Class<?>... parameterTypes)
   throws NoSuchMethodException, SecurityException

Parameters

parameterTypes − This is the parameter array.

Return Value

This method returns the Constructor object of the public constructor that matches the specified parameterTypes.

Exception

• NoSuchMethodException − If a matching method is not found.

• SecurityException − If a security manager, s, is present.

Example

The following example shows the usage of java.lang.Class.getConstructor() method.

package com.tutorialspoint;

import java.lang.reflect.*;

public class ClassDemo {

   public static void main(String[] args) {

      try {
         // returns the Constructor object of the public constructor
         Class cls[] = new Class[] { String.class };
         Constructor c = String.class.getConstructor(cls);
         System.out.println(c);
      } catch(Exception e) {
         System.out.println(e);
      } 
   }
}

Let us compile and run the above program, this will produce the following result −

public java.lang.String(java.lang.String)