Initial data commit

Task/Caesar-cipher/Java/caesar-cipher.java

@@ -0,0 +1,30 @@
+public class Cipher {
+    public static void main(String[] args) {
+
+        String str = "The quick brown fox Jumped over the lazy Dog";
+
+        System.out.println( Cipher.encode( str, 12 ));
+        System.out.println( Cipher.decode( Cipher.encode( str, 12), 12 ));
+    }
+
+    public static String decode(String enc, int offset) {
+        return encode(enc, 26-offset);
+    }
+
+    public static String encode(String enc, int offset) {
+        offset = offset % 26 + 26;
+        StringBuilder encoded = new StringBuilder();
+        for (char i : enc.toCharArray()) {
+            if (Character.isLetter(i)) {
+                if (Character.isUpperCase(i)) {
+                    encoded.append((char) ('A' + (i - 'A' + offset) % 26 ));
+                } else {
+                    encoded.append((char) ('a' + (i - 'a' + offset) % 26 ));
+                }
+            } else {
+                encoded.append(i);
+            }
+        }
+        return encoded.toString();
+    }
+}