Contract

```
@Documented
@Target(TYPE)
@Retention(CLASS)
public @interface Contract
```
Defines behavioral contract enforced at runtime by instances of annotated classes.

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  ThreadingBehavior threading
  Gets the threading behavior for annotated type.

- Element Detail
  - threading
```
ThreadingBehavior threading
```
    Gets the threading behavior for annotated type.
    The default value is ThreadingBehavior.UNSAFE.
    
    Returns:
    
    the threading behavior for annotated type.
    
    Default:
    
    org.apache.hc.core5.annotation.ThreadingBehavior.UNSAFE