Upload files to "java/base"

java/base/Unit.java

@@ -0,0 +1,16 @@
+package base;
+
+/**
+ * @author Georgiy Korneev (kgeorgiy@kgeorgiy.info)
+ */
+public final class Unit {
+
+    public static final Unit INSTANCE = new Unit();
+
+    private Unit() {}
+
+    @Override
+    public String toString() {
+        return "unit";
+    }
+}