| | |
| | | //然后提取公式 |
| | | String strs = formula.substring(0,formula.indexOf("(")); |
| | | String upperStr = strs.toUpperCase(); |
| | | if (upperStr.equals("")) { |
| | | throw new ErrorException(formula + "里面的公式没有函数"); |
| | | if (upperStr.matches(".*\\d.*")){ |
| | | upperStr=""; |
| | | } |
| | | System.out.println(upperStr); |
| | | //然后获取最外面括号里面的值,再根据","分割 |
| | |
| | | } |
| | | // 根据函数名称进行相应计算 |
| | | BigDecimal finalResult; |
| | | switch (upperStr) { |
| | | case "MAX": |
| | | finalResult = results.stream().max(BigDecimal::compareTo) |
| | | .orElseThrow(() -> new IllegalArgumentException("无法计算MAX值")); |
| | | break; |
| | | case "MIN": |
| | | finalResult = results.stream().min(BigDecimal::compareTo) |
| | | .orElseThrow(() -> new IllegalArgumentException("无法计算MIN值")); |
| | | break; |
| | | case "SUM": |
| | | finalResult = results.stream().reduce(BigDecimal.ZERO, BigDecimal::add); |
| | | break; |
| | | case "ABS": |
| | | finalResult = results.stream().map(BigDecimal::abs).reduce(BigDecimal.ZERO, BigDecimal::add); |
| | | break; |
| | | case "AVERAGE": |
| | | finalResult = results.stream().reduce(BigDecimal.ZERO, BigDecimal::divide) |
| | | .divide(BigDecimal.valueOf(results.size()), 2, BigDecimal.ROUND_HALF_UP); |
| | | break; |
| | | case "MEDIAN": |
| | | int size = results.size(); |
| | | if (size % 2 == 1) { |
| | | finalResult = results.get(size / 2); |
| | | } else { |
| | | BigDecimal sum = results.get(size / 2 - 1).add(results.get(size / 2)); |
| | | finalResult = sum.divide(BigDecimal.valueOf(2), 2, BigDecimal.ROUND_HALF_UP); |
| | | } |
| | | break; |
| | | default: |
| | | throw new UnsupportedOperationException("暂不支持函数: " + upperStr); |
| | | if (upperStr.equals("")||upperStr==null) { |
| | | finalResult=results.get(0); |
| | | }else { |
| | | switch (upperStr) { |
| | | case "MAX": |
| | | finalResult = results.stream().max(BigDecimal::compareTo) |
| | | .orElseThrow(() -> new IllegalArgumentException("无法计算MAX值")); |
| | | break; |
| | | case "MIN": |
| | | finalResult = results.stream().min(BigDecimal::compareTo) |
| | | .orElseThrow(() -> new IllegalArgumentException("无法计算MIN值")); |
| | | break; |
| | | case "SUM": |
| | | finalResult = results.stream().reduce(BigDecimal.ZERO, BigDecimal::add); |
| | | break; |
| | | case "ABS": |
| | | finalResult = results.stream().map(BigDecimal::abs).reduce(BigDecimal.ZERO, BigDecimal::add); |
| | | break; |
| | | case "AVERAGE": |
| | | finalResult = results.stream().reduce(BigDecimal.ZERO, BigDecimal::divide) |
| | | .divide(BigDecimal.valueOf(results.size()), 2, BigDecimal.ROUND_HALF_UP); |
| | | break; |
| | | case "MEDIAN": |
| | | int size = results.size(); |
| | | if (size % 2 == 1) { |
| | | finalResult = results.get(size / 2); |
| | | } else { |
| | | BigDecimal sum = results.get(size / 2 - 1).add(results.get(size / 2)); |
| | | finalResult = sum.divide(BigDecimal.valueOf(2), 2, BigDecimal.ROUND_HALF_UP); |
| | | } |
| | | break; |
| | | default: |
| | | throw new UnsupportedOperationException("暂不支持函数: " + upperStr); |
| | | } |
| | | } |
| | | System.out.println(results); |
| | | System.out.println("计算结果: " + finalResult); |