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...
If the argument value is already equal to a mathematical 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. Parameters: a a double value. Returns: the closest floati...
importjava.util.Scanner;importjava.util.HashMap;importjava.util.Map;publicclassIntegerStatistics{publicstaticvoidmain(String[]args){Scannerscanner=newScanner(System.in);System.out.print("请输入整数个数:");intcount=scanner.nextInt();int[]numbers=newint[count];for(inti=0;i<count;i++){System.ou...
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...
* 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. * * Note...
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,...
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...
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){}; ...