Java Class New Instance newInstance(Class clazz)

Description

Creates a new instance from the same type as the given Class.

License

Apache License

Parameter

Parameter	Description
T	the generic type
clazz	the Class object

Exception

Parameter	Description
ClassNotFoundException	the class not found exception
InstantiationException	the instantiation exception
IllegalAccessException	the illegal access exception

Return

the new instance

Declaration

public static <T> T newInstance(Class<T> clazz)
        throws InstantiationException, IllegalAccessException, ClassNotFoundException 

Method Source Code

//package com.java2s;
/**//  ww  w . j av a  2s.  c om
 * Copyright (C) 2007 Asterios Raptis
 *
 * 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.
 */

public class Main {
    /**
     * Creates a new instance from the same type as the given object.
     *
     * @param <T>
     *            the generic type
     * @param obj
     *            the obj
     * @return the new instance
     * @throws ClassNotFoundException
     *             the class not found exception
     * @throws InstantiationException
     *             the instantiation exception
     * @throws IllegalAccessException
     *             the illegal access exception
     */
    @SuppressWarnings("unchecked")
    public static <T> T newInstance(T obj)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException {
        return newInstance((Class<T>) Class.forName(obj.getClass().getCanonicalName()));
    }

    /**
     * Creates a new instance from the same type as the given Class.
     *
     * @param <T>
     *            the generic type
     * @param clazz
     *            the Class object
     * @return the new instance
     * @throws ClassNotFoundException
     *             the class not found exception
     * @throws InstantiationException
     *             the instantiation exception
     * @throws IllegalAccessException
     *             the illegal access exception
     */

    public static <T> T newInstance(Class<T> clazz)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException {
        return clazz.newInstance();
    }
}

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