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PlantUML Macro

class EverySecondIterator implements Iterator<Object> {
	Iterator<Object> iteratorDelegate
	EverySecondIterator(Iterator<Object>)
	boolean hasNext()
	Object next()
}
interface "Iterator<Object>" as iterator {
}
iterator <|-- EverySecondIterator
EverySecondIterator --> iterator: iteratorDelegate

Code Block

language	java

public class EverySecondIterator implements Iterator<Object> {
	
	private Iterator<Object> iteratorDelegate;
    
    public EverySecondIterator(Iterator<Object> iterator) {
        this.iteratorDelegate = iterator;
    }
    
    @Override
    public boolean hasNext() {
        return iteratorDelegate.hasNext();
    }

	@Override
    public Object next() {
        Object o = iteratorDelegate.next();
        if (iteratorDelegate.hasNext()) {
            iteratorDelegate.next();
        }
        return o;
    }
}

Vi ser at hvert kall til hasNext() vil resultere i et kall til hasNext() på delegaten (iteratorDelegate). Hvert kall vil next() vil imidlertid gi først et kall til next() på delgaten og så et kall til hasNext() og evt. et nytt kall til next().

PlantUML Macro

Hovedprogram --> EverySecondIterator: hasNext()
EverySecondIterator --> "iteratorDelegate: Iterator<Object>": hasNext()
Hovedprogram --> EverySecondIterator: next()
EverySecondIterator --> "iteratorDelegate: Iterator<Object>": next()
EverySecondIterator --> "iteratorDelegate: Iterator<Object>": hasNext()
EverySecondIterator --> "iteratorDelegate: Iterator<Object>": next()

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