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Using transferTo() between channels

// : c12:TransferTo.java // Using transferTo() between channels // {Args: TransferTo.java TransferTo.txt} // {Clean: TransferTo.txt} // From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002 // www.BruceEckel.com. See copyright notice in CopyRight.txt. import java.io.FileInputStream; import java.io.FileOutputStream; import java.nio.channels.FileChannel; public class TransferTo {   public static void main(String[] args) throws Exception {     if (args.length != 2) {       System.out.println("arguments: sourcefile destfile");       System.exit(1);     }     FileChannel in = new FileInputStream(args[0]).getChannel(), out = new FileOutputStream(         args[1]).getChannel();     in.transferTo(0, in.size(), out);     // Or:     // out.transferFrom(in, 0, in.size());   } } ///:~