Update out-of-date java client examples (#627)

* update out-of-date java client examples

* Remove semaphore from AsyncSimpleConsumerExample

Signed-off-by: Aaron Ai <[email protected]>

---------

Signed-off-by: Aaron Ai <[email protected]>
Co-authored-by: Aaron Ai <[email protected]>

java/client/src/main/java/org/apache/rocketmq/client/java/example/AsyncProducerExample.java

@@ -67,6 +67,6 @@ public static void main(String[] args) throws ClientException, InterruptedExcept
         Thread.sleep(Long.MAX_VALUE);
         // Close the producer when you don't need it anymore.
         // You could close it manually or add this into the JVM shutdown hook.
-        // producer.shutdown();
+        // producer.close();
     }
 }

java/client/src/main/java/org/apache/rocketmq/client/java/example/ProducerDelayMessageExample.java

@@ -61,6 +61,6 @@ public static void main(String[] args) throws ClientException {
         }
         // Close the producer when you don't need it anymore.
         // You could close it manually or add this into the JVM shutdown hook.
-        // producer.shutdown();
+        // producer.close();
     }
 }

java/client/src/main/java/org/apache/rocketmq/client/java/example/ProducerFifoMessageExample.java

@@ -59,6 +59,6 @@ public static void main(String[] args) throws ClientException {
         }
         // Close the producer when you don't need it anymore.
         // You could close it manually or add this into the JVM shutdown hook.
-        // producer.shutdown();
+        // producer.close();
     }
 }

java/client/src/main/java/org/apache/rocketmq/client/java/example/ProducerNormalMessageExample.java

@@ -57,6 +57,6 @@ public static void main(String[] args) throws ClientException {
         }
         // Close the producer when you don't need it anymore.
         // You could close it manually or add this into the JVM shutdown hook.
-        // producer.shutdown();
+        // producer.close();
     }
 }

java/client/src/main/java/org/apache/rocketmq/client/java/example/ProducerTransactionMessageExample.java

@@ -73,6 +73,6 @@ public static void main(String[] args) throws ClientException {
 
         // Close the producer when you don't need it anymore.
         // You could close it manually or add this into the JVM shutdown hook.
-        // producer.shutdown();
+        // producer.close();
     }
 }