原创@山枫叶纷飞 本文链接:https://www.cnblogs.com/zhazhaacmer/p/12093366.html 简介 使用 Preconditions.checkNotNull(...) 来处理, 相当于省掉自己再手写 throw new NullPointerExcepti
Generally,nullvariables, references and collections are tricky to handle in Java code. They are not only hard to identify but also complex to deal with. As a matter of fact, any miss in dealing withnullcannot be identified at compile time and results in aNullPointerExceptionat runtime. In ...
Check If Int Is Null In Java Int is primitive data type in java and Such data types in java stores data in binary form in memory by default. That means they can’t be null in java .So we can’t check int for a null value . On the other hand, Integer is an object and it can...
主要实现自动校验参数的功能 字符串的 非空(null和空白字符串) ,长度, 正则校验 数字(包括BigDecimal)的非空,范围,正则校验 集合的非空,集合大小校验 日期的非空,范围校验 所有类型的IN校验, a in (a,b,c) 支持递归校验,只需要在要递归校验的类上加上一个注解 对比已有框架hibernate-validator 不遵守较复杂...
值得注意的是, ObjectUtils.isEmpty() 是导自org.springframework.util.ObjectUtils,几乎涵盖了所有的常见Java对象 下面为这个方法isEmpty的主要代码: publicstaticbooleanisEmpty(@NullableObject obj){if(obj ==null) {returntrue; }elseif(objinstanceofOptional) {return!((Optional)obj).isPresent(); ...
问指定为非null的参数为null: kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull方法ENjava.lang....
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CHECK( Dsex IN ('男', '女')) } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 表级约束 CREATE TABLE RecipeDetail{ Rno VARCHAR(10), Mno VARCHAR(10) NOT NULL, Mamount DECIMAL(18,0), PRIMARY KEY(Rno,Mno), FOREIGN KEY(Mno)REFERENCES Medicine(Mno) ...
问指定为非null的参数为null: kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull方法EN今天遇到了...
NullPointerException - if the argument is null toString public String toString() Overrides: toString in class Enum<RevocationCheckAction> fromValue public static RevocationCheckAction fromValue(String value) Use this in place of valueOf. Parameters: value - real value Returns: Revocatio...