Example usage for java.lang.reflect Method getGenericReturnType

Introduction

In this page you can find the example usage for java.lang.reflect Method getGenericReturnType.

Prototype

public Type getGenericReturnType()

Source Link

Document

Returns a Type object that represents the formal return type of the method represented by this Method object.

Usage

From source file:Main.java

public static void main(String... args) {
    try {//  w  w w  . ja  v  a2s .c o  m
        Class<?> c = Class.forName("Main");
        Method[] allMethods = c.getDeclaredMethods();
        for (Method m : allMethods) {
            Type gpType = m.getGenericReturnType();
            System.out.println(gpType);

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

From source file:Deet.java

public static void main(String... args) {
    if (args.length != 4) {
        err.format("Usage: java Deet <classname> <langauge> <country> <variant>%n");
        return;/*from  w  ww . j  a va2 s  .  c  o m*/
    }

    try {
        Class<?> c = Class.forName(args[0]);
        Object t = c.newInstance();

        Method[] allMethods = c.getDeclaredMethods();
        for (Method m : allMethods) {
            String mname = m.getName();
            if (!mname.startsWith("test") || (m.getGenericReturnType() != boolean.class)) {
                continue;
            }
            Type[] pType = m.getGenericParameterTypes();
            if ((pType.length != 1) || Locale.class.isAssignableFrom(pType[0].getClass())) {
                continue;
            }

            out.format("invoking %s()%n", mname);
            try {
                m.setAccessible(true);
                Object o = m.invoke(t, new Locale(args[1], args[2], args[3]));
                out.format("%s() returned %b%n", mname, (Boolean) o);

                // Handle any exceptions thrown by method to be invoked.
            } catch (InvocationTargetException x) {
                Throwable cause = x.getCause();
                err.format("invocation of %s failed: %s%n", mname, cause.getMessage());
            }
        }

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

From source file:MethodSpy.java

public static void main(String... args) {
    try {//w  ww  . j  a v a 2 s . c  om
        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());

        }

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

From source file:MethodSpy.java

public static void main(String... args) {
    try {// ww w  .  java 2 s.  com
        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();
    }
}

From source file:Main.java

public static Class<?> getCollectionType(Method method) {
    if (method.getGenericReturnType() instanceof ParameterizedType) {
        ParameterizedType type = (ParameterizedType) method.getGenericReturnType();
        return (Class<?>) type.getActualTypeArguments()[0];
    }/*from   w w  w .j  av  a 2s . c  o m*/
    return Object.class;
}

From source file:Main.java

public static Type getMethodType(Class<?> clazz, String methodName) {
    try {/* w  ww.j a va  2s .com*/
        Method method = clazz.getMethod(methodName);

        return method.getGenericReturnType();
    } catch (Exception ex) {
        return null;
    }
}

From source file:com.netflix.hystrix.contrib.javanica.utils.TypeHelper.java

/**
 * Check whether return type of the given method is parametrized or not.
 *
 * @param method the method/*from w  w w .  j  a  va  2s  . c o  m*/
 * @return true - if return type is {@link ParameterizedType}, otherwise - false
 */
public static boolean isReturnTypeParametrized(Method method) {
    return method.getGenericReturnType() instanceof ParameterizedType;
}

From source file:ch.ifocusit.plantuml.utils.ClassUtils.java

public static Set<Class> getGenericTypes(Method method) {
    if (method.getGenericReturnType() instanceof ParameterizedType) {
        // manage generics
        return getGenericTypes((ParameterizedType) method.getGenericReturnType());
    }/*from  w  w  w. j a  v a 2s. c o  m*/
    return new HashSet<>();
}

From source file:me.hurel.hqlbuilder.internal.ProxyUtil.java

public static Class<?> getParameter(Method method) {
    return (Class<?>) ((ParameterizedType) method.getGenericReturnType()).getActualTypeArguments()[0];
}

From source file:com.liferay.apio.architect.internal.annotation.representor.processor.TypeProcessor.java

private static java.lang.reflect.Type _getGenericType(Method method) {
    ParameterizedType parameterizedType = (ParameterizedType) method.getGenericReturnType();

    return parameterizedType.getActualTypeArguments()[0];
}