Queue4 SourceCode GPL - https://github.com/iboxdb/db4o-gpl

All Known Subinterfaces:

BlockingQueue4<T>, PausableBlockingQueue4<T>, TimeoutBlockingQueue4<T>

All Known Implementing Classes:

BlockingQueue, DelegatingBlockingQueue, NoDuplicatesQueue, NonblockingQueue, PausableBlockingQueue, TimeoutBlockingQueue
```
public interface Queue4<E>
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`add(E obj)`
`boolean`	`hasNext()`
`Iterator4`	`iterator()`
`E`	`next()`
`E`	`nextMatching(Predicate4<E> condition)`	Returns the next object in the queue that matches the specified condition.

- Method Detail
  - add
```
void add(E obj)
```
  - next
```
E next()
```
  - hasNext
```
boolean hasNext()
```
  - nextMatching
```
E nextMatching(Predicate4<E> condition)
```
    Returns the next object in the queue that matches the specified condition. The operation is always NON-BLOCKING.
    
    Parameters:
    
    condition - the object must satisfy to be returned
    
    Returns:
    
    the object satisfying the condition or null if none does
  - iterator
```
Iterator4 iterator()
```