Java Method getTypeParameters() Method

The getTypeParameters () method of Method class returns an array of type TypeVariable objects that represent the type of variables declared by the generic declaration represented by this Generic Declaration object, in the same order in which declared. If underlying generic declares no type variable, then an array of length 0 is returned.

Syntax

Parameter

No parameter is passed.

Returns

the array of TypeVariable objects representing the type variables declared by this generic declaration

Throw

GenericSignatureFormatError

Example 1

  //import statement
import java.lang.reflect.Method;  //import method class of reflect
import java.lang.reflect.TypeVariable;

public class ReflectMethodgetTypeParametersExample1<T> {

  <E extends RuntimeException> T ThrowX(T t) throws E {
    return t;
  }

  public static void main(String... args) {
    try {
      Class<?> c = Class.forName("ReflectMethodgetTypeParametersExample1");
      Method[] mthd = c.getDeclaredMethods();
      for (Method m : mthd) {
        TypeVariable[] tp = m.getTypeParameters();
        for(TypeVariable t:tp){
          System.out.println(tp);
        }
        

      }
    } catch (ClassNotFoundException x) {
      x.printStackTrace();
    }
  }
}

Test it Now

Output:

[Ljava.lang.reflect.TypeVariable;@7852e922

Example 2

import java.lang.reflect.Method; 
import java.lang.reflect.TypeVariable; 
  
public class ReflectMethodgetTypeParametersExample2 { 
  
    public <N extends Number> void getMethodX(N n) 
    { 
    } 
  
    public static void main(String args[]) 
    { 
  
        try { 
 
            Class c = ReflectMethodgetTypeParametersExample2.class; 
  
            Method[] mthd = c.getMethods(); 
  
            for (Method m : mthd) { 
  
                TypeVariable[] tp = m.getTypeParameters(); 
  
                for (TypeVariable t : tp) { 
  
                    System.out.println("Type variable for Method Name "
                                       + m.getName() + " is "
                                       + t.getName()); 
                } 
            } 
        } 
        catch (Exception e) { 
  
            // print Exception Messgae if 
            // any exception occured in program 
            e.printStackTrace(); 
        } 
    } 
}

Test it Now

Output:

Type variable for Method Name getMethodX is N

Next TopicJava Method Class

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