A class level constraint has access to the bean instance rather than one of its properties and applies some constraint logic based on several properties.
类级别的约束能获取Bean实例，而不是它的某一属性，还能应用一些基于若干属性的约束。
A class level constraint has access to the bean instance rather than one of its properties and applies some constraint logic based on several properties.
类级别的约束能获取Bean实例，而不是它的某一属性，还能应用一些基于若干属性的约束。
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