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The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

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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.io.output;

import java.io.IOException;
import java.io.OutputStream;

/**
 * This OutputStream writes all data to the famous /dev/null.
 * 
 * This output stream has no destination (file/socket etc.) and all
 * bytes written to it are ignored and lost.
 *
 * @version $Id: NullOutputStream.java 1674708 2015-04-20 00:02:45Z ggregory $
 */
public class NullOutputStream extends OutputStream {

    /**
     * A singleton.
     */
    public static final NullOutputStream NULL_OUTPUT_STREAM = new NullOutputStream();

    /**
     * Does nothing - output to /dev/null.
     * @param b The bytes to write
     * @param off The start offset
     * @param len The number of bytes to write
     */
    @Override
    public void write(final byte[] b, final int off, final int len) {
        //to /dev/null
    }

    /**
     * Does nothing - output to /dev/null.
     * @param b The byte to write
     */
    @Override
    public void write(final int b) {
        //to /dev/null
    }

    /**
     * Does nothing - output to /dev/null.
     * @param b The bytes to write
     * @throws IOException never
     */
    @Override
    public void write(final byte[] b) throws IOException {
        //to /dev/null
    }

}