jdk-24/test/jdk/java/nio/channels/Channels/ReadByte.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/* @test
 * @bug 4773447
 * @summary Test Channels.newInputStream.read() method
 */

import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.Channels;
import java.io.InputStream;
import java.io.IOException;

public class ReadByte {
    public static void main(String[] args) throws IOException {
        ReadableByteChannel channel = new ReadableByteChannel() {
            public int read(ByteBuffer dst) {
                dst.put((byte) 129);
                return 1;
            }

            public boolean isOpen() {
                return true;
            }

            public void close() {
            }
        };

        InputStream in = Channels.newInputStream(channel);
        int data = in.read();
        if (data < 0)
            throw new RuntimeException(
                "InputStream.read() spec'd to return 0-255");
    }
}