Iterator 模式
![Iterator Pattern Iterator Pattern](https://www.tutorialspoint.com/design_pattern/images/iterator_pattern_uml_diagram.jpg)
public interface Iterator {
public boolean hasNext();
public Object next();
}
public interface Container {
public Iterator getIterator();
}
public class NameRepository implements Container {
public String names[] = {"Robert" , "John" ,"Julie" , "Lora"};
@Override
public Iterator getIterator() {
return new NameIterator();
}
private class NameIterator implements Iterator {
int index;
@Override
public boolean hasNext() {
return index < names.length;
}
@Override
public Object next() {
return hasNext() ? names[index++] : null;
}
}
}
public class IteratorPatternDemo {
public static void main(String[] args) {
NameRepository namesRepository = new NameRepository();
for(Iterator iter = namesRepository.getIterator(); iter.hasNext();){
String name = (String)iter.next();
System.out.println("Name : " + name);
}
}
}
Name : Robert
Name : John
Name : Julie
Name : Lora