JAVA代码格式 Google-java-format VS AlibabaP3C

IDE 配置模板文件说明： $color{red}{新增基于Google格式的xml配置文件}$

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）

行开始缩进 Google 2 Alibaba 4
换行缩进都是4

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);

链接：https://www.jianshu.com/p/17a145a76b07
来源：简书

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原文地址：https://www.cnblogs.com/shoshana-kong/p/14981129.html