Use constants or objects with specific values to call equals

[zhaohai666]

Make sure set the target branch to develop

What is the purpose of the change

The equals method of an object is easy to throw a null pointer. You should use a constant or an object with a certain value to call equals.

Brief changelog

Use constants or objects with specific values to call equals

Verifying this change

Scanning through the tool has fixed this issue

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[coveralls]

Coverage increased (+0.1%) to 54.206% when pulling 67ebc460c212ccbe14673a6ace283edb2713752e on zhaohai1299002788:dev-constants-equals into 44bdeedad2d0e28717f5012d375d12af76305bb5 on apache:develop.

[codecov-commenter]

Codecov Report

Merging #3235 (67ebc46) into develop (44bdeed) will decrease coverage by 0.11%. The diff coverage is 15.78%.

@@              Coverage Diff              @@
##             develop    #3235      +/-   ##
=============================================
- Coverage      48.07%   47.95%   -0.12%     
+ Complexity      4573     4557      -16     
=============================================
  Files            552      554       +2     
  Lines          36521    36523       +2     
  Branches        4818     4818              
=============================================
- Hits           17557    17515      -42     
- Misses         16749    16789      +40     
- Partials        2215     2219       +4     

Impacted Files	Coverage Δ
.../rocketmq/broker/offset/ConsumerOffsetManager.java	15.70% <ø> (ø)
...cketmq/broker/processor/QueryMessageProcessor.java	5.71% <0.00%> (ø)
.../broker/subscription/SubscriptionGroupManager.java	70.58% <ø> (ø)
...ache/rocketmq/broker/topic/TopicConfigManager.java	59.07% <ø> (ø)
...ketmq/client/consumer/DefaultLitePullConsumer.java	74.53% <ø> (ø)
...ocketmq/client/consumer/DefaultMQPullConsumer.java	33.33% <ø> (ø)
...ocketmq/client/consumer/DefaultMQPushConsumer.java	54.54% <ø> (ø)
...client/consumer/store/RemoteBrokerOffsetStore.java	64.86% <ø> (ø)
...g/apache/rocketmq/client/impl/MQClientAPIImpl.java	12.18% <0.00%> (ø)
...pl/consumer/ConsumeMessageConcurrentlyService.java	48.54% <ø> (+0.97%)	:arrow_up:
... and 75 more

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[odbozhou]

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