[ROCKETMQ-291] Fix System.out.printf throws UnknownFormatConversionException

Author: lindzh <linsony0@163.com>

Closes #168 from lindzh/fix_print.

example/src/main/java/org/apache/rocketmq/example/broadcast/PushConsumer.java

@@ -42,7 +42,7 @@ public class PushConsumer {
             @Override
             public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                 ConsumeConcurrentlyContext context) {
-                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
             }
         });

example/src/main/java/org/apache/rocketmq/example/filter/Consumer.java

@@ -44,7 +44,7 @@ public class Consumer {
             @Override
             public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                 ConsumeConcurrentlyContext context) {
-                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
             }
         });

example/src/main/java/org/apache/rocketmq/example/filter/SqlConsumer.java

@@ -45,7 +45,7 @@ public class SqlConsumer {
             @Override
             public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                 ConsumeConcurrentlyContext context) {
-                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
             }
         });

example/src/main/java/org/apache/rocketmq/example/ordermessage/Consumer.java

@@ -41,7 +41,7 @@ public class Consumer {
             @Override
             public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) {
                 context.setAutoCommit(false);
-                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 this.consumeTimes.incrementAndGet();
                 if ((this.consumeTimes.get() % 2) == 0) {
                     return ConsumeOrderlyStatus.SUCCESS;

example/src/main/java/org/apache/rocketmq/example/quickstart/Consumer.java

@@ -67,7 +67,7 @@ public class Consumer {
             @Override
             public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                 ConsumeConcurrentlyContext context) {
-                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
             }
         });

example/src/main/java/org/apache/rocketmq/example/simple/PullConsumer.java

@@ -34,7 +34,7 @@ public class PullConsumer {
 
         Set<MessageQueue> mqs = consumer.fetchSubscribeMessageQueues("TopicTest1");
         for (MessageQueue mq : mqs) {
-            System.out.printf("Consume from the queue: " + mq + "%n");
+            System.out.printf("Consume from the queue: %s%n", mq);
             SINGLE_MQ:
             while (true) {
                 try {

example/src/main/java/org/apache/rocketmq/example/simple/PushConsumer.java

@@ -37,7 +37,7 @@ public class PushConsumer {
 
             @Override
             public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
-                System.out.printf(Thread.currentThread().getName() + " Receive New Messages: " + msgs + "%n");
+                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
             }
         });

example/src/main/java/org/apache/rocketmq/example/transaction/TransactionCheckListenerImpl.java

@@ -26,7 +26,7 @@ public class TransactionCheckListenerImpl implements TransactionCheckListener {
 
     @Override
     public LocalTransactionState checkLocalTransactionState(MessageExt msg) {
-        System.out.printf("server checking TrMsg " + msg.toString() + "%n");
+        System.out.printf("server checking TrMsg %s%n", msg);
 
         int value = transactionIndex.getAndIncrement();
         if ((value % 6) == 0) {