How can you specify allowed values for validation in Java?

2 years ago

Isabella Edwards

1 minute

In Java, you can specify allowed values using annotations. Here are some commonly used annotations:

@NotNull: Specifies that the field cannot be null.
@Size: Specifies the size limitation of a field, such as the length of a string.
@Min and @Max: specify the minimum and maximum values for the field.
@Pattern: Specify the regular expression for the field.
@Email: The specified field must be a valid email address.

These annotations can be used to validate values at compile time or runtime. For example, you can use these annotations on method parameters to restrict the values of the parameters. If the value of the parameter does not meet the specified conditions, the corresponding exception will be thrown.