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Using transferTo() between channels

import java.io.FileInputStream; import java.io.FileOutputStream; import java.nio.channels.FileChannel; public class MainClass {   public static void main(String[] args) throws Exception {     FileChannel in = new FileInputStream("source.txt").getChannel(), out = new FileOutputStream(         "target.txt").getChannel();     in.transferTo(0, in.size(), out);     // Or:     // out.transferFrom(in, 0, in.size());   } }