Revision: 473
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at July 15, 2006 02:54 by cetnar
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public class NumberBox<N extends Number> extends Box<N> {
public NumberBox( ) {
super( );
}
// Sum everything in the box
public double sum( ) {
double total = 0;
for (Iterator<N> i = contents.iterator( ); i.hasNext( ); ) {
total = total + i.next( ).doubleValue( );
}
return total;
}
}
You can use this same syntax in method definitions:
public static double sum(Box<? extends Number> box1,
Box<? extends Number> box2) {
double total = 0;
for (Iterator<? extends Number> i = box1.contents.iterator( );
i.hasNext( ); ) {
total = total + i.next( ).doubleValue( );
}
for (Iterator<? extends Number> i = box2.contents.iterator( );
i.hasNext( ); ) {
total = total + i.next( ).doubleValue( );
}
return total;
}
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Za typ N można podstawić dowolny typ dziedziczący po Number.
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Generics - List of unknown - adding type restrictions.
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Java