JAVA代码格式 Google-java-format VS AlibabaP3C

IDE 配置模板文件说明：

文档：java代码格式化模板（阿里代码规范）
地址：https://www.jianshu.com/p/9befe7710176

基于项目需要，调研规范java格式，基于 Alibaba P3C 和 Google 做一个简单对比

Google:
文档：https://google.github.io/styleguide/javaguide.html
源码：https://github.com/google/google-java-format
安装：Idea或Eclipse插件
安装文档：无需文档，装插件就好
阿里巴巴：
文档&源码：https://github.com/google/google-java-format
安装：Idea插件 + eclipse-code-format.xml 模板文件
安装文档：https://www.jianshu.com/p/9befe7710176

优缺点对比

配置：

Google: 缩进、换行之类目前全是代码里固定的，不提供配置文件，自定义支持不友好。不过目前已经很好看了
Alibaba: 基于 eclipse-codestyle.xml ，配置较灵活，同时也很麻烦

具体代码对比示例（自行决定使用哪一个）

1. 行开始缩进 Google 2 Alibaba 4

2. 换行缩进 都是4

3. 单行块注释

   Google:
     /** 外部估值数据 */
   Alibaba: 
       /**
        * 外部估值数据
        */
   

4. 换行逻辑：
   Google 优先 "=" 后换行，"." "(" 后换行 ，优先级从左往右：= . (
   Alibaba 到哪哪换行

   Google:
     private static final Set ADJUSTSTS_TODETAIL =
         new HashSet<>(
             Arrays.asList(
                 "1002", "1021", "1031", "1221", "1207", "2001", "2203", "2204", "2221", "2232",
                 "3003"));
   Alibaba:
       private static final Set ADJUSTSTS_TODETAIL = new HashSet<>(Arrays.asList("1002",
           "1021", "1031", "1221", "1207", "2001", "2203", "2204", "2221", "2232", "3003"));
   

5. 代码块换行：Google 在 "{" 后换行

   Google:
     private static final String[][] ADJUSTSTS_4001 = {
       {"104", "400101"},
       {"104A", "40010A"},
       {"104B", "40010B"},
       {"104C", "40010C"}
     };
   Alibaba:
       private static final String[][] ADJUSTSTS_4001 = {{"104", "400101"},
           {"104A", "40010A"},
           {"104B", "40010B"},
           {"104C", "40010C"}
       };
   

6. 参数换行：Google 在 "(" 后换行，如果1行不足，会每个单数独占一行 (方法定义和调用一致)

   Google:
     public ValuationCheckProcess_Google(
         int productNum, long tradeDate, boolean needCallBack, boolean processCheckFlag) {}
   Alibaba:
       public ValuationCheckProcess_AlibabaP3C(int productNum, long tradeDate, boolean needCallBack,
           boolean processCheckFlag) {}
           
   Google:
     public ValuationCheckProcess_Google(
         int productNum,
         long tradeDate,
         Map valuationMap,
         Map valuationTotalMap) {}
   Alibaba:
       public ValuationCheckProcess_AlibabaP3C(int productNum, long tradeDate,
           Map valuationMap,
           Map valuationTotalMap) {}
   
   Google:
       return ProcessUtil.getProcessStatus(
           tradeDate,
           productNum,
           isAsset ? EvaluationConst.ASSET_EV_PROCESS : EvaluationConst.EV_PROCESS_CHECK,
           EvaluationConst.EV_Process_check_2,
           EvaluationConst.ev_status_3);
   Alibaba:
           return ProcessUtil.getProcessStatus(tradeDate, productNum,
               isAsset ? EvaluationConst.ASSET_EV_PROCESS : EvaluationConst.EV_PROCESS_CHECK,
               EvaluationConst.EV_Process_check_2, EvaluationConst.ev_status_3);
   

7. Lambda表达式：

   Google:
       uncheckOuterData =
           uncheckOuterData.entrySet().stream()
               .filter(map -> !map.getKey().startsWith(defineL1))
               .collect(Collectors.toMap(h -> h.getKey(), h -> h.getValue()));
   Alibaba:
       uncheckOuterData = uncheckOuterData.entrySet().stream()
           .filter(map -> !map.getKey().startsWith(defineL1))
           .collect(Collectors.toMap(h -> h.getKey(), h -> h.getValue()));
   Google:
       uncheckOuterData =
           uncheckOuterData.entrySet().stream()
               .filter(
                   map ->
                       map.getKey().length() > 4
                           || (map.getKey().length() == 4
                               && String.valueOf(map.getKey().charAt(3)).matches("[0-9]")))
               .collect(Collectors.toMap(h -> h.getKey(), h -> h.getValue()));
   Alibaba:
       uncheckOuterData = uncheckOuterData.entrySet().stream()
           .filter(map -> map.getKey().length() > 4 || (map.getKey().length() == 4
               && String.valueOf(map.getKey().charAt(3)).matches("[0-9]")))
           .collect(Collectors.toMap(h -> h.getKey(), h -> h.getValue()));
   Google:
       Map filterSubjects =
           allSubjects.values().stream()
               .filter(
                   e ->
                       !ParaChecker.isNull(e.getStkId())
                           && e.getSubjectlevel() == 4
                           && e.getSubjectAttrId().toUpperCase().indexOf("INVESTAPPRECIATION") == -1)
               .collect(Collectors.toMap(e -> e.getSubjectId(), e -> e));
   Alibaba:
       Map filterSubjects = allSubjects.values().stream()
               .filter(e -> !ParaChecker.isNull(e.getStkId()) && e.getSubjectlevel() == 4
                   && e.getSubjectAttrId().toUpperCase().indexOf("INVESTAPPRECIATION") == -1)
               .collect(Collectors.toMap(e -> e.getSubjectId(), e -> e));
   

8. 逻辑判断：

   Google:
       if (MathUtil.round(inner.getStkValue(), 4) != MathUtil.round(outer.getStkValue(), 4)
           || (!subject.equals("1109")
               && MathUtil.round(inner.getPostCostAmt(), 4)
                   != MathUtil.round(outer.getPostCostAmt(), 4))) {}
   Alibaba:
       if (MathUtil.round(inner.getStkValue(), 4) != MathUtil.round(outer.getStkValue(), 4)
           || (!subject.equals("1109") && MathUtil.round(inner.getPostCostAmt(), 4) != MathUtil
               .round(outer.getPostCostAmt(), 4))) {}
   Google:            
       if (subject.length() > 8
           && !subject.startsWith("1202")
           && !subject.startsWith("2202")
           && !onlyCheckStkValue(inner)
           && MathUtil.round(inner.getPostQtyF(), 4) != MathUtil.round(outer.getPostQtyF(), 4)) {}
   Alibaba:
       if (subject.length() > 8 && !subject.startsWith("1202")
           && !subject.startsWith("2202") && !onlyCheckStkValue(inner)
           && MathUtil.round(inner.getPostQtyF(), 4) != MathUtil.round(outer.getPostQtyF(), 4)) {}
   

9. 三目运算：

   Google:
       EvaluationUtil.recordEVProcess(
           productNum,
           tradeDate,
           isAsset
               ? EvaluationConst.ASSET_EV_PROCESS
               : checkValueType == EvaluationConst.CHECKVALUETYPE_1
                   ? EvaluationConst.EV_PROCESS_REALTIME
                   : EvaluationConst.EV_PROCESS_CHECK,
           checkValueType == EvaluationConst.CHECKVALUETYPE_1
               ? EvaluationConst.EV_Process_realtime_19
               : EvaluationConst.EV_Process_check_3,
           ev_status,
           beginTime,
           endTime,
           diff,
           flag,
           evaluationType,
           null);
   Alibaba:
       EvaluationUtil.recordEVProcess(productNum, tradeDate,
           isAsset ? EvaluationConst.ASSET_EV_PROCESS
               : checkValueType == EvaluationConst.CHECKVALUETYPE_1
                   ? EvaluationConst.EV_PROCESS_REALTIME : EvaluationConst.EV_PROCESS_CHECK,
           checkValueType == EvaluationConst.CHECKVALUETYPE_1
               ? EvaluationConst.EV_Process_realtime_19 : EvaluationConst.EV_Process_check_3,
           ev_status, beginTime, endTime, diff, flag, evaluationType, null);