Java Class Loader loadClass(String className)

Description

load Class

License

Apache License

Declaration

@SuppressWarnings({ "unchecked" })
    public static <T> Class<T> loadClass(String className) 

Method Source Code

//package com.java2s;
/**/*  w w  w.j av a  2  s.  co m*/
 * Copyright (C) 2011 Ovea <dev@ovea.com>
 *
 * 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.net.URL;
import java.net.URLClassLoader;
import java.util.Arrays;

public class Main {
    @SuppressWarnings({ "unchecked" })
    public static <T> Class<T> loadClass(String className) {
        try {
            return (Class<T>) Thread.currentThread().getContextClassLoader().loadClass(className);
        } catch (ClassNotFoundException e) {
            URL[] cp = tryToGetContextClassPath();
            throw new IllegalArgumentException("Cannot load class [" + className + "] from classpath "
                    + (cp == null ? "<unknown>" : Arrays.deepToString(cp)), e);
        }
    }

    public static URL[] tryToGetContextClassPath() {
        return tryToGetClassPath(Thread.currentThread().getContextClassLoader());
    }

    public static URL[] tryToGetClassPath(ClassLoader cl) {
        if (cl instanceof URLClassLoader) {
            return ((URLClassLoader) cl).getURLs();
        }
        return new URL[0];
    }
}

Related

1. loadArrayClass(ClassLoader cl, String aName)
2. loadClass(ClassLoader cl, String cName)
3. loadClass(final File baseFolder, final String qualifiedType)
4. loadClass(final File classFolder, final String className)
5. loadClass(String className)
6. loadClass(String dir, String classname)
7. loadClass(String name)
8. loadClass(String name, Object fallbackClass)
9. loadClasses(Collection filenames, String packageName, File outputDir)