基於Java8的LINQ開源專案：Java Enumerable

private Function<Iterable<TSource>, Iterator<TSource>> iteratorGenerator;
 
public static <TSource> Enumerable<TSource> init(Iterable<TSource> source){
    return new Enumerable<>(_ig -> new EnumerableIterator<>(source));      
}                                                                          
 
protected Enumerable(Function<Iterable<TSource>, Iterator<TSource>> iteratorGenerator) {
    this.iteratorGenerator = iteratorGenerator;                                         
}                                                                                       
 
@Override                               
public Iterator<TSource> iterator() {    
    return iteratorGenerator.apply(this);
}                                        
        
// The underlying iterator
 
public class EnumerableIterator<TSource> implements Iterator<TSource> {
    protected Iterator<TSource> source;
    private Iterable<TSource> input;
 
    public EnumerableIterator(Iterable<TSource> input){
        this.input = input;
 
        reset();
    }
 
    protected void reset(){
        source = input.iterator();
    }
 
    @Override
    public boolean hasNext() {
        return source.hasNext();
    }
 
    @Override
    public TSource next() {
        return (TSource)source.next();
    }
}               
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