get Parameter Types and get Generic ParameterTypes : Generic « Reflection « Java






  1. Java
  2. Reflection
  3. Generic

get Parameter Types and get Generic ParameterTypes

     
        
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import static java.lang.System.out;

import java.lang.reflect.Method;
import java.lang.reflect.Type;

public class MethodSpy {
  private static final String fmt = "%24s: %s%n";

  // for the morbidly curious
  <E extends RuntimeException> void genericThrow() throws E {
  }

  public static void main(String... args) {
    try {
      Class<?> c = Class.forName(args[0]);
      Method[] allMethods = c.getDeclaredMethods();
      for (Method m : allMethods) {
        if (!m.getName().equals(args[1])) {
          continue;
        }
        out.format("%s%n", m.toGenericString());

        out.format(fmt, "ReturnType", m.getReturnType());
        out.format(fmt, "GenericReturnType", m.getGenericReturnType());

        Class<?>[] pType = m.getParameterTypes();
        Type[] gpType = m.getGenericParameterTypes();
        for (int i = 0; i < pType.length; i++) {
          out.format(fmt, "ParameterType", pType[i]);
          out.format(fmt, "GenericParameterType", gpType[i]);
        }


      }

      // production code should handle these exceptions more gracefully
    } catch (ClassNotFoundException x) {
      x.printStackTrace();
    }
  }
}








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