Initial data commit

Task/URL-decoding/Java/url-decoding-1.java

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+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;

Task/URL-decoding/Java/url-decoding-2.java

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+URLDecoder.decode("http%3A%2F%2Ffoo%20bar%2F", StandardCharsets.UTF_8)

Task/URL-decoding/Java/url-decoding-3.java

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+import java.util.regex.Matcher;
+import java.util.regex.Pattern;

Task/URL-decoding/Java/url-decoding-4.java

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+String decode(String string) {
+    Pattern pattern = Pattern.compile("%([A-Za-z\\d]{2})");
+    Matcher matcher = pattern.matcher(string);
+    StringBuilder decoded = new StringBuilder(string);
+    char character;
+    int start, end, offset = 0;
+    while (matcher.find()) {
+        character = (char) Integer.parseInt(matcher.group(1), 16);
+        /* offset the matched index since were adjusting the string */
+        start = matcher.start() - offset;
+        end = matcher.end() - offset;
+        decoded.replace(start, end, String.valueOf(character));
+        offset += 2;
+    }
+    return decoded.toString();
+}