Java Class New Instance newInstance(Class clazz)

Description

new Instance

License

Apache License

Declaration

static <T> T newInstance(Class<T> clazz) 

Method Source Code

//package com.java2s;
/*/*  w ww . j  a v  a 2s  .  co  m*/
 *      Copyright (C) 2012-2015 DataStax Inc.
 *
 *   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 java.lang.reflect.*;

public class Main {
    static <T> T newInstance(Class<T> clazz) {
        Constructor<T> publicConstructor;
        try {
            publicConstructor = clazz.getConstructor();
        } catch (NoSuchMethodException e) {
            try {
                // try private constructor
                Constructor<T> privateConstructor = clazz.getDeclaredConstructor();
                privateConstructor.setAccessible(true);
                return privateConstructor.newInstance();
            } catch (Exception e1) {
                throw new IllegalArgumentException("Can't create an instance of " + clazz, e);
            }
        }
        try {
            return publicConstructor.newInstance();
        } catch (Exception e) {
            throw new IllegalArgumentException("Can't create an instance of " + clazz, e);
        }
    }
}

Related

1. newInstance(Class clazz)
2. newInstance(Class clazz)
3. newInstance(Class clazz)
4. newInstance(Class clazz)
5. newInstance(Class clazz)
6. newInstance(Class clazz)
7. newInstance(Class clazz)
8. newInstance(Class clazz)
9. newInstance(Class clazz)