Java Reflection - Java Constructor .getParameterTypes ()

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Syntax

Constructor.getParameterTypes() has the following syntax.

public Class <?>[] getParameterTypes()

Example

In the following code shows how to use Constructor.getParameterTypes() method.

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
//from  ww  w.  j a v  a  2 s. c o m
public class Main {
  public static void main(String[] argv) throws Exception {
    Constructor[] constructors = String.class.getDeclaredConstructors();
    for (int i = 0; i < constructors.length; i++) {
      Constructor c = constructors[i];
      Class[] paramTypes = c.getParameterTypes();
      String name = c.getName();
      System.out.print(Modifier.toString(c.getModifiers()));
      System.out.print(" " + name + "(");
      for (int j = 0; j < paramTypes.length; j++) {
        if (j > 0)
          System.out.print(", ");
        System.out.print(paramTypes[j].getCanonicalName());
      }
      System.out.println(");");
    }
  }
}

The output:

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