### Question:
RedisUtil { public String set(final String key, final String value) { return execute(key, new HashRedisExecutor<String>() { @Override public String execute(Jedis jedis) { return jedis.set(key, value); } }); } private  RedisUtil(); static RedisUtil getInstance(); T execute(String key, HashRedisExecutor<T> executor); String set(final String key, final String value); String set(final String key, final String value, final String nxxx, final String expx, final long time); String get(final String key); Boolean exists(final String key); Long setnx(final String key, final String value); String setex(final String key, final int seconds, final String value); Long expire(final String key, final int seconds); Long incr(final String key); Long decr(final String key); Long hset(final String key, final String field, final String value); String hget(final String key, final String field); String hmset(final String key, final Map<String, String> hash); List<String> hmget(final String key, final String... fields); Long del(final String key); Map<String, String> hgetAll(final String key); Object evalsha(final String sha1, final List keys, final List params); Object scriptLoad(final String script); void destroy();  }### Answer:
@Test public void set() { RedisUtil.getInstance().set("test", "test"); }