code cleanup: clean imports

src/main/java/com/alibaba/ttl/TtlCallable.java

@@ -2,14 +2,12 @@ package com.alibaba.ttl;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.Callable;
 import java.util.concurrent.atomic.AtomicReference;
-import java.util.Collections;
 
-import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.capture;
-import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.replay;
-import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.restore;
+import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.*;
 
 /**
  * {@link TtlCallable} decorate {@link Callable}, so as to get {@link TransmittableThreadLocal}

src/main/java/com/alibaba/ttl/TtlTimerTask.java

@@ -3,9 +3,7 @@ package com.alibaba.ttl;
 import java.util.TimerTask;
 import java.util.concurrent.atomic.AtomicReference;
 
-import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.capture;
-import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.replay;
-import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.restore;
+import static com.alibaba.ttl.TransmittableThreadLocal.Transmitter.*;
 
 /**
  * {@link TtlTimerTask} decorate {@link TimerTask}, so as to get {@link TransmittableThreadLocal}

src/main/java/com/alibaba/ttl/threadpool/ExecutorServiceTtlWrapper.java

 package com.alibaba.ttl.threadpool;
 
+import com.alibaba.ttl.TransmittableThreadLocal;
 import com.alibaba.ttl.TtlCallable;
 import com.alibaba.ttl.TtlRunnable;
-import com.alibaba.ttl.TransmittableThreadLocal;
 
 import java.util.Collection;
 import java.util.List;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
+import java.util.concurrent.*;
 
 /**
  * {@link TransmittableThreadLocal} Wrapper of {@link ExecutorService},

src/main/java/com/alibaba/ttl/threadpool/ExecutorTtlWrapper.java

 package com.alibaba.ttl.threadpool;
 
-import com.alibaba.ttl.TtlRunnable;
 import com.alibaba.ttl.TransmittableThreadLocal;
+import com.alibaba.ttl.TtlRunnable;
 
 import java.util.concurrent.Executor;
 

src/main/java/com/alibaba/ttl/threadpool/ScheduledExecutorServiceTtlWrapper.java

 package com.alibaba.ttl.threadpool;
 
+import com.alibaba.ttl.TransmittableThreadLocal;
 import com.alibaba.ttl.TtlCallable;
 import com.alibaba.ttl.TtlRunnable;
-import com.alibaba.ttl.TransmittableThreadLocal;
 
 import java.util.concurrent.Callable;
 import java.util.concurrent.ScheduledExecutorService;

src/main/java/com/alibaba/ttl/threadpool/TtlExecutors.java

@@ -10,7 +10,6 @@ import java.util.concurrent.ScheduledExecutorService;
  * Factory Utils for getting TTL Wrapper of jdk executors.
  *
  * @author Jerry Lee (oldratlee at gmail dot com)
- * @since 0.9.0
  * @see java.util.concurrent.Executor
  * @see java.util.concurrent.ExecutorService
  * @see java.util.concurrent.ThreadPoolExecutor
@@ -18,6 +17,7 @@ import java.util.concurrent.ScheduledExecutorService;
  * @see java.util.concurrent.Executors
  * @see java.util.concurrent.CompletionService
  * @see java.util.concurrent.ExecutorCompletionService
+ * @since 0.9.0
  */
 public final class TtlExecutors {
     /**