Update all new Tasks

Task/File-input-output/Java/file-input-output-3.java

@@ -0,0 +1,26 @@
+import java.io.*;
+import java.nio.channels.*;
+
+public class FileIODemo3 {
+  public static void main(String args[]) {
+    try {
+      final FileChannel in = new FileInputStream("input.txt").getChannel();
+      try {
+        final FileChannel out = new FileOutputStream("output.txt").getChannel();
+        try {
+          out.transferFrom(in, 0, in.size());
+        }
+        finally {
+          out.close();
+        }
+      }
+      finally {
+        in.close();
+      }
+    }
+    catch (Exception e) {
+      System.err.println("Exception while trying to copy: "+e);
+      e.printStackTrace(); // stack trace of place where it happened
+    }
+  }
+}