القيود المدمجة

في هذا الدرس

pick the right standard constraint.

الموضوعات المخطط لها

• @NotNull (not null), @NotBlank (text with a visible character), @NotEmpty (not empty collection or text).
• @Size(min, max), @Min, @Max, @Positive, @PositiveOrZero, @DecimalMin.
• @Pattern(regexp=...), @Email, @Past, @Future.
• Constraints on nested objects and elements need @Valid on the field.
• Null is treated as valid by most constraints except @NotNull, @NotBlank, @NotEmpty.