java.lang.reflect.Constructor.getParameterTypes() Method Example

Description

The java.lang.reflect.Constructor.getParameterTypes() method returns an array of Class objects that represent the formal parameter types, in declaration order, of the constructor represented by this Constructor object. Returns an array of length 0 if the underlying constructor takes no parameters.

Declaration

Following is the declaration for java.lang.reflect.Constructor.getParameterTypes() method.

public Class<?>[] getParameterTypes()

Returns

the parameter types for the constructor this object represents.

Example

The following example shows the usage of java.lang.reflect.Constructor.getParameterTypes() method.

package com.tutorialspoint;

import java.lang.reflect.Constructor;

public class ConstructorDemo {
   public static void main(String[] args) {

      Constructor[] constructors = SampleClass.class.getConstructors();
      Class[] parameterTypes = constructors[1].getParameterTypes();

      for(Class parameterType: parameterTypes){
         System.out.println(parameterType.getName());   
 
      }
   }
}

class SampleClass {
   private String sampleField;
   
   public SampleClass(){
   }

   public SampleClass(String sampleField){
      this.sampleField = sampleField;
   }

   public String getSampleField() {
      return sampleField;
   }

   public void setSampleField(String sampleField) {
      this.sampleField = sampleField;
   } 
}

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

java.lang.String