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YAML for Java 8 and above. Very similar to the JSON-P api.
The newest version!
/**
 * Copyright (c) 2016-2024, Mihai Emil Andronache
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 * Neither the name of the copyright holder nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
package com.amihaiemil.eoyaml;

import javax.json.JsonArray;
import javax.json.JsonObject;
import java.io.*;

/**
 * Yaml.
 * @author Mihai Andronache ([email protected])
 * @version $Id: dfa80c2ecce2c242711cd7064785574005e0283c $
 * @since 1.0.0
 * @todo #231:60min Wiki documentation is needed for YAML mappings from JSON.
 *  (fromJsonObject() and fromJsonArray()).
 */
public final class Yaml {

    /**
     * Hidden ctor.
     */
    private Yaml(){}

    /**
     * Create an immutable, thread-safe, {@link YamlMappingBuilder}.
     * @return Builder of YamlMapping.
     */
    public static YamlMappingBuilder createYamlMappingBuilder() {
        return new RtYamlMappingBuilder();
    }

    /**
     * Create a mutable, NOT thread-safe, {@link YamlMappingBuilder}.
     * @return Builder of YamlMapping.
     */
    public static YamlMappingBuilder createMutableYamlMappingBuilder() {
        return new MutableYamlMappingBuilder();
    }

    /**
     * Create an immutable, thread-safe, {@link YamlSequenceBuilder}.
     * @return Builder of YamlMapping.
     */
    public static YamlSequenceBuilder createYamlSequenceBuilder() {
        return new RtYamlSequenceBuilder();
    }

    /**
     * Create a mutable, NOT thread-safe, {@link YamlSequenceBuilder}.
     * @return Builder of YamlMapping.
     */
    public static YamlSequenceBuilder createMutableYamlSequenceBuilder() {
        return new MutableYamlSequenceBuilder();
    }

    /**
     * Create a {@link YamlScalarBuilder}.
     * @return Builder of Yaml Scalars.
     */
    public static YamlScalarBuilder createYamlScalarBuilder() {
        return new RtYamlScalarBuilder();
    }

    /**
     * Create a {@link YamlStreamBuilder}.
     * @return Builder of YamlStream.
     */
    public static YamlStreamBuilder createYamlStreamBuilder() {
        return new RtYamlStreamBuilder();
    }

    /**
     * Create a {@link YamlInput} from a File.
     * @return YamlInput, reader of Yaml.
     * @param input File to read from
     * @throws FileNotFoundException If the file is not found.
     */
    public static YamlInput createYamlInput(
        final File input
    ) throws FileNotFoundException {
        return Yaml.createYamlInput(new FileReader(input));
    }

    /**
     * Create a {@link YamlInput} from a String.
     * @param input String to read from.
     * @return YamlInput, reader of Yaml.
     */
    public static YamlInput createYamlInput(final String input) {
        return Yaml.createYamlInput(new StringReader(input));
    }

    /**
     * Create a {@link YamlInput} from an InputStream.
     * @param input InputStream to read from.
     * @return YamlInput, reader of Yaml.
     */
    public static YamlInput createYamlInput(final InputStream input) {
        return new RtYamlInput(new InputStreamReader(input));
    }

    /**
     * Create a {@link YamlInput} from a Reader.
     * @param input Reader to read from.
     * @return YamlInput, reader of Yaml.
     */
    public static YamlInput createYamlInput(final Reader input) {
        return new RtYamlInput(input);
    }

    /**
     * Create a YamlPrinter to write a YamlNode somewhere. If you want to
     * print a YamlNode to String, just use YamlNode.toString() -- it is a
     * convenience equivalent to:
     *      *   final YamlNode yaml = ...;
     *   final StringWriter stgWriter = new StringWriter();
     *   Yaml.createYamlPrinter(stgWriter).print(yaml);
     *   System.out.println(stgWriter.toString());
     * 
     * @param destination Writer where the YamlNode will be printed.
     * @return YamlPrinter.
     */
    public static YamlPrinter createYamlPrinter(final Writer destination) {
        return Yaml.createYamlPrinter(destination, System.lineSeparator());
    }

    /**
     * Create a YamlPrinter to write a YamlNode somewhere, with the specified
     * line separator. If you want to print a YamlNode to String, just use
     * YamlNode.toString() -- it is a convenience equivalent to:
     *      *   final YamlNode yaml = ...;
     *   final StringWriter stgWriter = new StringWriter();
     *   Yaml.createYamlPrinter(stgWriter).print(yaml);
     *   System.out.println(stgWriter.toString());
     * 
     * @param destination Writer where the YamlNode will be printed.
     * @param lineSeparator Line separator.
     * @return YamlPrinter.
     */
    public static YamlPrinter createYamlPrinter(
        final Writer destination, final String lineSeparator
    ) {
        return new RtYamlPrinter(destination, lineSeparator);
    }

    /**
     * Create a YAML dump to represent the given object as YAML.
     * @param object Object to dump.
     * @return YamlDump.
     */
    public static YamlDump createYamlDump(final Object object) {
        return new ReflectedYamlDump(object);
    }

    /**
     * Create a YAML mapping from a {@link JsonObject}.
     * @param object JsonObject in question.
     * @return YamlMapping.
     */
    public static YamlMapping fromJsonObject(final JsonObject object) {
        return new JsonYamlMapping(object);
    }

    /**
     * Create a YAML sequence from a {@link JsonArray}.
     * @param array JsonArray in question.
     * @return YamlSequence.
     */
    public static YamlSequence fromJsonArray(final JsonArray array){
        return new JsonYamlSequence(array);
    }
}