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Interfaces should be used to define types. Using an interface as a collection of
static methods and fields violates that, and can lead to confusing type
hierarchies if the interface is then implemented to allow easy access to the
constants.
Prefer using a `public final` class instead to prohibit subclassing.
```java
public interface Constants {
final float PI = 3.14159f;
}
```
```java
public final class Constants {
public static final float PI = 3.14159f;
private Constants() {}
}
```
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