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Code Block

language	java

Person grandmother = new Person()
Collection<Person> grandchildren = new ArrayList<Person>();
// Person.getChildren() returns the children as a Collection 
for (Person child : grandmother.getChildren()) {
	// Collection.addAll takes another Collection as its only argument
	grandchildren.addAll(child.getChildren());
}

...

Code Block

language	java

Person hallvard = Person("H")p1, anne = Person("A")p2, jens = Person("J")p3
// Person.addChild adds a single child
hallvard.addChild(anne);
hallvard.addChild(jens);

Code Block

language	java

Person hallvard = Person("H")p1, anne = Person("A")p2, jens = Person("J")p3
// Person.addChildren takes a Collection-argument and adds them all
Collection<Person> anneOgJens = new ArrayList<Person>();
anneOgJens.add(anne);
anneOgJens.add(jens);
hallvard.addChildren(anneOgJens);

...

Code Block

language	java
title	Metode med varargs-parameter

public void addChildren(Person... children) {
	for (int i = 0; i < children.length; i++) {
		this.addChild(children[i]);
	}
}

Code Block

language	java
title	Bruk av metode med varargs-parameter

Person hallvard = Person("H")p1, anne = Person("A")p2, jens = Person("J")p3
// Person.addChildren adds alle its arguments
hallvard.addChildren(anne, jens);

Code Block

language	java
title	Alternativ bruk av metode med varargs-parameter

Person hallvard = Person("H")p1, anne = Person("A")p2, jens = Person("J")p3
Person[] anneOgJens = {anne, jens}
hallvard.addChildren(anneOgJens);

...

Code Block

Person hallvard = new Person("H"), anne = new Person("A"), jens = new Person("J")
// Person.addChildren takes a Collection-argument and adds them all
hallvard.addChildren(Arrays.asList(anne, jens)); // utlize that Arrays.asList is a varargs-method

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Versions Compared

Old Version 7

New Version 8

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