Writing to multiple output streams in Java

MultiplexOutputStream.java

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

/**
 * <p>
 * MultiplexOutputStream allows you to write to multiple output streams "at once".
 * It allows you to use one outputstream writer to write to multiple outputstreams
 * without repeating yourself.
 * Based off <a href="https://github.com/creditdatamw/kapenta/blob/master/src/main/java/com/creditdatamw/labs/kapenta/io/MultiplexOutputStream.java">MultiplexOutputStream.java</a>
 */
public class MultiplexOutputStream extends OutputStream {

    private OutputStream[] outputStreams;

    public MultiplexOutputStream(OutputStream... outputStreams) {
        java.util.Objects.requireNonNull(outputStreams);
        assert(outputStreams.length > 0);
        for(Object o: outputStreams) {
            java.util.Objects.requireNonNull(o);
        }
        this.outputStreams = outputStreams;
    }

    @Override
    public void write(int b) throws IOException {
        for(OutputStream os: outputStreams) {
            os.write(b);
        }
    }

    @Override
    public void write(byte[] b) throws IOException {
        for(OutputStream os: outputStreams) {
            os.write(b);
        }
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        for(OutputStream os: outputStreams) {
            os.write(b, off, len);
        }
    }

    @Override
    public void flush() throws IOException {
        for(OutputStream os: outputStreams) {
            os.flush();
        }
    }

    @Override
    public void close() throws IOException {
        for(OutputStream os: outputStreams) {
            os.close();
        }
    }
}

MultiplexOutputStreamExample.java

public class MultiplexOutputStreamExample {
  public static void main(String... args) {
    File file1 = new File("output-1.txt");
    File file2 = new File("/tmp/backup/output-2.txt");
    try (FileOutputStream fos1 = new FileOutputStream(file1);
          FileOutputStream fos2 = new FileOutputStream(file2);
          MultiplexOutputStream mos = new MultiplexOutputStream(fos1, fos2)) {
      
        Files.copy(Paths.get("input.txt"), mos);
    } catch(IOException ex) {
        ex.printStackTrace();
    }
  }
}

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