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）
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行开始缩进 Google 2 Alibaba 4
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换行缩进 都是4
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单行块注释
Google: /** 外部估值数据 */ Alibaba: /** * 外部估值数据 */ -
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<String> ADJUSTSTS_TODETAIL = new HashSet<>( Arrays.asList( "1002", "1021", "1031", "1221", "1207", "2001", "2203", "2204", "2221", "2232", "3003")); Alibaba: private static final Set<String> ADJUSTSTS_TODETAIL = new HashSet<>(Arrays.asList("1002", "1021", "1031", "1221", "1207", "2001", "2203", "2204", "2221", "2232", "3003")); -
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"} }; -
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<String, BSide_EV_Valuation> valuationMap, Map<String, BSide_EV_ValuationTotal> valuationTotalMap) {} Alibaba: public ValuationCheckProcess_AlibabaP3C(int productNum, long tradeDate, Map<String, BSide_EV_Valuation> valuationMap, Map<String, BSide_EV_ValuationTotal> 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); -
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<String, BSide_EV_Subject> 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<String, BSide_EV_Subject> 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)); -
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)) {} -
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);
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