Data commit

Task/Rot-13/Java/rot-13.java

@@ -0,0 +1,33 @@
+import java.io.*;
+
+public class Rot13 {
+
+    public static void main(String[] args) throws IOException {
+        if (args.length >= 1) {
+            for (String file : args) {
+                try (InputStream in = new BufferedInputStream(new FileInputStream(file))) {
+                    rot13(in, System.out);
+                }
+            }
+        } else {
+            rot13(System.in, System.out);
+        }
+    }
+
+    private static void rot13(InputStream in, OutputStream out) throws IOException {
+        int ch;
+        while ((ch = in.read()) != -1) {
+            out.write(rot13((char) ch));
+        }
+    }
+
+    private static char rot13(char ch) {
+        if (ch >= 'A' && ch <= 'Z') {
+            return (char) (((ch - 'A') + 13) % 26 + 'A');
+        }
+        if (ch >= 'a' && ch <= 'z') {
+            return (char) (((ch - 'a') + 13) % 26 + 'a');
+        }
+        return ch;
+    }
+}