Java Reflection Constructor Invoke invokeConstructor(final Class clazz, final Class[] paramTypes, final Object... args)

Description

Invokes a constructor.

License

Apache License

Parameter

Parameter	Description
clazz	The class on which to invoke the constructor.
paramTypes	The parameter types.
args	The argument types.
T	The type of object to create.

Return

The resulting object; or null if an exception occurred.

Declaration

@Nullable
private static <T> T invokeConstructor(final Class<T> clazz, final Class<?>[] paramTypes,
        final Object... args) 

Method Source Code

//package com.java2s;
/*/*w w  w.ja v a2s . c o  m*/
 * Copyright ? 2015-2016
 *
 * This file is part of Spoofax for IntelliJ.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import javax.annotation.Nullable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public class Main {
    /**
     * Invokes a constructor.
     *
     * @param clazz The class on which to invoke the constructor.
     * @param paramTypes The parameter types.
     * @param args The argument types.
     * @param <T> The type of object to create.
     * @return The resulting object; or <code>null</code> if an exception occurred.
     */
    @Nullable
    private static <T> T invokeConstructor(final Class<T> clazz, final Class<?>[] paramTypes,
            final Object... args) {
        assert paramTypes.length == args.length;

        @Nullable
        T obj = null;
        try {
            if (paramTypes.length > 0) {
                final Constructor<T> constructor = clazz.getConstructor(paramTypes);
                obj = constructor.newInstance(args);
            } else {
                obj = clazz.newInstance();
            }
        } catch (NoSuchMethodException | IllegalAccessException | InstantiationException
                | InvocationTargetException ex) {
            // Ignore.
        }
        return obj;
    }
}

Related

1. invokeConstructor(Class clazz, Class[] argTypes, Object[] args)
2. invokeConstructor(Class cls)
3. invokeConstructor(Class type, Object value)
4. invokeConstructor(Constructor constructor, Object... arguments)
5. invokeConstructor(Constructor constructor, Object... parameters)
6. invokeConstructor(final Constructor constructor, final Object... args)
7. invokeConstructor(final Constructor constructor, final Object[] args)
8. invokeConstructor(final Constructor constructor, final Object... args)
9. invokeConstructor(String className, Class[] paramTypes, Object[] paramValues)