import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * A utility similar to {@link IteratorTester} for testing a {@link ListIterator} against a known
 * good reference implementation. As with {@code IteratorTester}, a concrete subclass must provide

 */
package org.codelibs.core.io;

import static org.codelibs.core.log.Logger.format;

import java.io.Closeable;
import java.io.IOException;

import org.codelibs.core.log.Logger;

/**
 * Utility class for {@link Closeable} operations.
 *
 * @author koichik
 */
public abstract class CloseableUtil {

    /**
     * Do not instantiate.
     */
    protected CloseableUtil() {
    }

 */
package org.codelibs.core.xml;

import javax.xml.XMLConstants;
import javax.xml.validation.SchemaFactory;

import org.codelibs.core.log.Logger;

/**
 * Utility class for {@link SchemaFactory}.
 *
 * @author koichik
 */
public abstract class SchemaFactoryUtil {

    private static final Logger logger = Logger.getLogger(SchemaFactoryUtil.class);

    /**

package com.google.common.testing;

import com.google.common.annotations.GwtCompatible;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jspecify.annotations.NullMarked;

/**
 * Simple utility for when you want to create a {@link TearDown} that may throw an exception but
 * should not fail a test when it does. (The behavior of a {@code TearDown} that throws an exception

 */
package org.codelibs.core.net;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.SecureRandom;

import org.codelibs.core.lang.StringUtil;

/**
 * Utility for creating UUIDs.
 *
 * @author higa
 */
public abstract class UuidUtil {

    /**
     * Do not instantiate.
     */
    protected UuidUtil() {
    }

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.core.exception.SAXRuntimeException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

/**
 * Utility class for {@link DocumentBuilder}.
 *
 * @author higa
 */
public abstract class DocumentBuilderUtil {

    /**
     * Do not instantiate.
     */
    protected DocumentBuilderUtil() {
    }

And be compatible with all of them at the same time.

///

Create a utility function to hash a password coming from the user.

And another utility to verify if a received password matches the hash stored.

And another one to authenticate and return a user.

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

/**
 * Basic utility libraries and interfaces.
 *
 * <p>This package is a part of the open-source <a href="https://github.com/google/guava">Guava</a>
 * library.
 *
 * <h2>Contents</h2>
 *

     */
    public static final int DEFAULT_MAX_READ_WRITE_SIZE = 1048576; // 1MB

    /**
     * Private constructor to prevent instantiation
     */
    private RdmaCapabilities() {
        // Utility class
    }

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.codelibs.core.exception.ClIllegalStateException;
import org.codelibs.core.exception.NoSuchAlgorithmRuntimeException;

/**
 * Utility for handling {@link MessageDigest}.
 *
 * @author higa
 * @author shinsuke
 */
public abstract class MessageDigestUtil {

    /**
     * Do not instantiate.
     */
    protected MessageDigestUtil() {