TheWikipediaarticle onnegative zeroexplains that negative zero is a computing-oriented concept rather than a mathematical concept. Because Java treats (positive) zero the same as negative zero in terms of equality comparisons, this concept of a negative zero and a positive zero is often not a pro...
为了解决这个问题,我们可以在条件分支的末尾添加一个默认的返回值,以保证方法在任何情况下都有返回值。 publicStringmyMethod(intnum){if(num>0){return"Positive";}elseif(num<0){return"Negative";}return"Zero";} 1. 2. 3. 4. 5. 6. 7. 8. 3. 异常处理导致返回值为空 在Java 中,方法可能会抛出...
* integer, then the result is the same as the argument. * If the argument is NaN or an infinity or positive zero or negative * zero, then the result is the same as the argument. * If the argument value is less than zero but greater than -1.0, * then the result is negative zero....
importjava.util.regex.Pattern;importjava.util.regex.Matcher;publicclassMain{publicstaticvoidmain(String[]args){Stringinput="-123";PatternpositivePattern=Pattern.compile("^[1-9]\\d*$");PatternnegativePattern=Pattern.compile("^-[1-9]\\d*$");PatternzeroPattern=Pattern.compile("^0$");Matcherpos...
java复制代码publicclassMathUtils{publicstaticintsquare(int num){assert num>0:"Input parameter must be positive";returnnum*num;}} 在调用square()方法时,如果输入参数为负数,则会中断程序并抛出 AssertionError 异常。 4.2 检查返回值 在函数或方法的出口处,可以使用 assert 断言检查返回值是否满足特定条件。例...
描述:Javax.validation是 spring 集成自带的一个参数校验接口。可通过添加注解来设置校验条件。springboot框架创建web项目后,不需要再添加其他的依赖。 使用:在Controller上使用 @Valid 或 @Validated 注解开启校验 publicStringtest(@RequestBody@ValidMyRequest req){}; ...
Negative 判断负数 NegativeOrZero 判断负数或0 Positive 判断正数 PositiveOrZero 判断正数或0 NotNull 不能为null Null 必须为 null Pattern(value)@Pattern(regexp = ) 被注释的元素必须符合指定的正则表达式 Size(max, min) 检查该字段的size是否在min和max之间,可以是字符串、数组、集合、Map等 Length(max,...
If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument. Parameters: a a double value. Returns: the closest floating-point value to a that is equal to a mathematical integer. ...
java.core.foundational.operator.ternary; import java.util.Scanner; /** * 判断用户输入的是正数还是负数或者0 * * @author tony 18601767221@163.com * @version 2023/7/21 18:15 * @since Java17 */ public class TernaryOperatorExample3JudgePositiveNumberNegativeNumberZero { public static void main(...
} public class Account { @PositiveOrZero(message = "账户余额不能为负数", groups = AccountChecks.class, payload = ErrorPayloads.class) private BigDecimal balance; // 账户余额验证,确保余额非负。 } @Negative 16.1 注解作用介绍 @Negative 注解用于验证数值类型的字段是否严格小于 0。 16.2 注解属性...