Java Class New Instance newInstance(String clazzStr)

Description

new Instance

License

Apache License

Declaration

public static Object newInstance(String clazzStr) 

Method Source Code

//package com.java2s;
/* Copyright 2012-2013 the original author or authors.
 *
 * 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.//from   w w w  .  j  av  a2  s.c  o  m
 */

public class Main {

    public static Object newInstance(String clazzStr) {
        try {
            Class<?> clazz = loadClass(clazzStr);
            return instantiate(clazz);
        } catch (Exception ex) {
        }
        return null;
    }

    public static Class<?> loadClass(String className) throws ClassNotFoundException {
        try {
            return Thread.currentThread().getContextClassLoader().loadClass(className);
        } catch (ClassNotFoundException e) {
            try {
                return Class.forName(className);
            } catch (ClassNotFoundException ex) {
                try {
                    return ClassLoader.class.getClassLoader().loadClass(className);
                } catch (ClassNotFoundException exc) {
                    throw exc;
                }
            }
        }
    }

    public static <T> T instantiate(Class<T> clazz) {
        if (clazz.isInterface()) {
            return null;
        }
        try {
            return clazz.newInstance();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }
}

Related

1. newInstance(String className, Object[] args)
2. newInstance(String className, Object[] args)
3. newInstance(String className, Object[] args)
4. newInstance(String classname, Properties properties)
5. newInstance(String clazz)
6. newInstance(String cls, Class interfaceType)
7. newInstance(String klass)
8. newInstance(String name)
9. newInstance(String name, ClassLoader loader)