Java Method getGenericParameterTypes() Method

The getGenericParameterTypes() method of Constructor class returns an array of Type objects representing the formal parameter types, in the order in which they are declared. If the underlying executable takes no parameters an array of length 0 is returned.

Syntax

Parameter

No parameter is passed.

Returns

an array of Types that represent the formal parameter types of the underlying executable

Throw

GenericSignatureFormatError

TypeNotPresentException

MalformedParameterizedTypeException.

Example 1

  //import statement  
import java.lang.reflect.Constructor; //import constructor
import java.lang.reflect.Type;
public class ReflectMethodgetGenericParameterTypesExample1  {
   public static void main(String[] args) {
      Constructor[] cnstrct = DemoXClass12.class.getConstructors();
      Type[] prmtr = cnstrct[1].getGenericParameterTypes();
      for (int i = 0; i < prmtr.length; i++) {
         System.out.println(prmtr[i]);
      }
   }
}

class DemoXClass12 {
   private String Field;
   public DemoXClass12() throws ArrayIndexOutOfBoundsException {
   }

   public DemoXClass12(String Field){
      this.Field = Field;
   }

   public String getField() {
      return Field;
   }

   public void setField(String Field) {
      this.Field = Field; 
   } 
}

Test it Now

Output:

class java.lang.String

Example 2

import java.lang.reflect.Constructor;
import java.lang.reflect.Type;

public class ReflectMethodgetGenericParameterTypesExample2  {

   public static void main(String[] args) {

      Constructor[] cnstrct = DemoXClass13.class.getConstructors();
      Type[] prmtr = cnstrct[1].getGenericParameterTypes();
      for (int i = 0; i < prmtr.length; i++) {
         System.out.println(prmtr[i]);
      }
   }
}

class DemoXClass13 {
   private String Field;
   private int num1;
   

   public DemoXClass13() throws ArrayIndexOutOfBoundsException {
   }

   public DemoXClass13(String Field, int num1){
      this.Field = Field;
      this.num1 = num1 ;
   }
   public String getField() {
      return Field;
   }
   public void setField(String Field) {
      this.Field = Field; 
   } 
      public int getnum1() {
      return num1;
   }
   public void setnum1(int num1) {
      this.num1 = num1; 
   } 
}

Test it Now

Output: