最近碰到个非常有意思的坑,先来看段代码: Test test = new Test(); Integer age = Objects.nonNull(test) ?...上面的这段代码就相当于如下: Test test = new Test(); // 当 age 为 null 时就出现可恶的 NPE Integer age = Objects.nonNull...就得多个心眼了,可以像下面这样写: Test test = new Test(); // 前后都是包装类型,避免编译器拆箱后再比较 Integer age = Objects.nonNull...System.out.println("age = " + age); 或者干脆就不用三元运算: Test test = new Test(); Integer age ; if (Objects.nonNull
JSON.toJSONString(ogg.getValue, SerializerFeature.PrettyFormat), classOf[ChargeStandardBean]) if (Objects.nonNull...JSON.toJSONString(ogg.getValue, SerializerFeature.PrettyFormat), classOf[CompanyDotMapBean]) if (Objects.nonNull...JSON.toJSONString(ogg.getValue, SerializerFeature.PrettyFormat), classOf[DeliverRegionBean]) if (Objects.nonNull...(JSON.toJSONString(ogg.getValue, SerializerFeature.PrettyFormat), classOf[ExpressBillBean]) if (Objects.nonNull...JSON.toJSONString(ogg.getValue, SerializerFeature.PrettyFormat), classOf[OutWarehouseBean]) if (Objects.nonNull
普通: Integer thisValue; if (Objects.nonNull(value)) { thisValue = value; } else { thisValue =...(user)) { Address address = user.getAddress(); if (Objects.nonNull(address)) { Country...普通: public boolean isSuper(Long userId) UserDO user = userDAO.get(userId); if (Objects.nonNull...普通: String line = readLine(); while (Objects.nonNull(line)) { ... // 处理逻辑代码 line = readLine()...; } 精简: for (String line = readLine(); Objects.nonNull(line); line = readLine()) { ... // 处理逻辑代码
(this.leftNode)) this.leftNode.frontShow(); if (Objects.nonNull(this.rightNode...(this.leftNode)) this.leftNode.backShow(); if (Objects.nonNull(this.rightNode...(this.value)) System.out.print(this.value + ","); if (Objects.nonNull(this.leftNode...(this.leftNode) && Objects.nonNull(this.rightNode)) { Node tempLeftNode = this.leftNode...0 : this.rightNode.height(); } public void show() { if (Objects.nonNull(this.leftNode
rocketMQListener; } @Override public void destroy() { this.setRunning(false); if (Objects.nonNull...this.toString()); } @Override public void stop() { if (this.isRunning()) { if (Objects.nonNull...targetClass.getSuperclass(); while ((Objects.isNull(interfaces) || 0 == interfaces.length) && Objects.nonNull...superclass.getGenericInterfaces(); superclass = targetClass.getSuperclass(); } if (Objects.nonNull...Type[] actualTypeArguments = parameterizedType.getActualTypeArguments(); if (Objects.nonNull
Objects.nonNull(examinePaper)) { return; } if (Objects.nonNull(examinePaper.getScore...Objects.nonNull(examinePaper)) { return; } if (!"...Nobita".equals(examinePaper.getName())) { return; } if (Objects.nonNull(examinePaper.getScore...Objects.nonNull(examinePaper)) { return; } if (!"...Nobita".equals(examinePaper.getName())) { return; } if (Objects.nonNull(examinePaper.getScore
ValidatorMin validatorMin = field.getAnnotation(ValidatorMin.class); //判断字符是否为空 if (Objects.nonNull...field.getName() + "不可以为空"); return false; } } if ((Objects.nonNull...(validatorMax) || Objects.nonNull(validatorMin)) && field.getType().equals(Integer.class) &&...if (field.getType().equals(Integer.class) || field.getType() == int.class) { if (Objects.nonNull...field.getName() + "字段大于了最大值"); return false; } if (Objects.nonNull
boolean isPassed(Long userId) { // 获取通过阈值 double thisPassThreshold = PASS_THRESHOLD; if (Objects.nonNull...return passRate >= thisPassThreshold; } // 获取通过阈值函数 private double getPassThreshold() { if (Objects.nonNull...(user)) { UserAccount account = user.getAccount(); if (Objects.nonNull(account)) {...account)) { // 累加用户余额 Double balance = account.getBalance(); if (Objects.nonNull...---- 9.1 案例一:把简单条件表达式封装为函数 现象描述: // 获取门票价格函数 public double getTicketPrice(Date currDate) { if (Objects.nonNull
boolean isPassed(Long userId) { // 获取通过阈值 double thisPassThreshold = PASS_THRESHOLD; if (Objects.nonNull...return passRate >= thisPassThreshold; } // 获取通过阈值函数 private double getPassThreshold() { if (Objects.nonNull...(user)) { UserAccount account = user.getAccount(); if (Objects.nonNull(account)) {...account)) { // 累加用户余额 Double balance = account.getBalance(); if (Objects.nonNull...封装条件表达式函数 案例一:把简单条件表达式封装为函数 现象描述: // 获取门票价格函数 public double getTicketPrice(Date currDate) { if (Objects.nonNull
strategyMap.get("B"); Function functionC = strategyMap.get("C"); if (Objects.nonNull...(functionA)) { System.out.println(functionA.apply("A")); } if (Objects.nonNull...(functionB)) { System.out.println(functionA.apply("B")); } if (Objects.nonNull
if (Objects.nonNull(a)) { if (Objects.nonNull(a.getB())) { if (Objects.nonNull
return fileName; } public WorkbookUtil setFileName(String fileName) { if (Objects.nonNull...>, HSSFSheet> sheetBiFunction){ HSSFSheet sheet = this.sheets.get(sheetIndex); if (Objects.nonNull...(merged) && Objects.nonNull(list) && Objects.isNull(sheetBiFunction)) { // 默认行列同时合并逻辑...>, HSSFSheet> sheetBiFunction) { HSSFSheet sheet = this.sheets.get(sheetIndex); if (Objects.nonNull...>, HSSFSheet> sheetBiFunction) { HSSFSheet sheet = this.sheets.get(sheetIndex); if (Objects.nonNull
String machine){ String formatDate = LOCAL_DATEFORMAT.get().format(new Date()); if (Objects.nonNull...out of MAX: " + sb.toString()); }else { this.sequence = 0; } if (Objects.nonNull...throw new RuntimeException("sequence out of MAX: " + sb.toString()); } if (Objects.nonNull...String formatDate = LOCAL_DATEFORMAT.get().format(new Date()); String no = ""; if (Objects.nonNull...String formatDate = LOCAL_DATEFORMAT.get().format(new Date()); String no = ""; if (Objects.nonNull
users; } 12.2 案例二:尽量避免返回的列表为null,引起不必要的空指针判断 现象描述: // 调用代码 List userList = queryUser(); if (Objects.nonNull...16.1 案例一:利用临时变量厘清逻辑 现象描述: // 是否土豪用户函数 private boolean isRichUser(User user) { return Objects.nonNull...(user.getAccount()) && Objects.nonNull(user.getAccount().getBalance()) && user.getAccount...{ UserVO vo = new UserVO(); vo.setId(user.getId()); vo.setName(user.getName()); if (Objects.nonNull...user.getId()); vo.setName(user.getName()); UserAccount account = user.getAccount(); if (Objects.nonNull
rocketMQListener; } @Override public void destroy() { this.setRunning(false); if (Objects.nonNull...()); } @Override public void stop() { if (this.isRunning()) { if (Objects.nonNull...targetClass.getSuperclass(); while ((Objects.isNull(interfaces) || 0 == interfaces.length) && Objects.nonNull...superclass.getGenericInterfaces(); superclass = targetClass.getSuperclass(); } if (Objects.nonNull...Type[] actualTypeArguments = parameterizedType.getActualTypeArguments(); if (Objects.nonNull
获取方法参数名称 */ String[] parameterNames = methodSignature.getParameterNames(); if (Objects.nonNull...(parameterNames) && Objects.nonNull(args) && parameterNames.length > 0 && args.length...i = 0; i < parameterNames.length; i++) { Object arg = args[i]; if (Objects.nonNull...RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes(); if (Objects.nonNull
String lockKeyPrefix = lock.lockKey(); String businessCode = lock.businessCode(); if (Objects.nonNull...(lockKeyPrefix) && Objects.nonNull(businessCode)) { return lockKeyPrefix + ":" + businessCode...; } else if (Objects.nonNull(lockKeyPrefix)) { return lockKeyPrefix; } else...if (Objects.nonNull(businessCode)) { return businessCode; } else { String
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