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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package org.apache.commons.lang3;

import java.net.URLClassLoader;
import java.util.Arrays;

/**
 * Helps work with {@link ClassLoader}.
 *
 * @since 3.10
 */
public class ClassLoaderUtils {

    /**
     * Converts the given class loader to a String calling {@link #toString(URLClassLoader)}.
     *
     * @param classLoader to URLClassLoader to convert.
     * @return the formatted string.
     */
    public static String toString(final ClassLoader classLoader) {
        if (classLoader instanceof URLClassLoader) {
            return toString((URLClassLoader) classLoader);
        }
        return classLoader.toString();
    }

    /**
     * Converts the given URLClassLoader to a String in the format
     * {@code "URLClassLoader.toString() + [URL1, URL2, ...]"}.
     *
     * @param classLoader to URLClassLoader to convert.
     * @return the formatted string.
     */
    public static String toString(final URLClassLoader classLoader) {
        return classLoader + Arrays.toString(classLoader.getURLs());
    }
}