Question
public class BoxDemo
{
public static <U> void addBox(U u, java.util.List<Box<U>> boxes)
{
Box<U> box = new Box<>();
box.set(u);
boxes.add(box);
}
public static <U> void outputBoxes(java.util.List<Box<U>> boxes)
{
int counter = 0;
for (Box<U> box: boxes)
{
U boxContents = box.get();
System.out.println("Box #" + counter + " contains [" + boxContents.toString() + "]");
counter++;
}
}
public static void main(String[] args)
{
java.util.ArrayList<Box<Integer>> listOfIntegerBoxes = new java.util.ArrayList<>();
BoxDemo.<Integer>addBox(Integer.valueOf(10), listOfIntegerBoxes);
BoxDemo.outputBoxes(listOfIntegerBoxes);
}
}a.
10
b.
Box #0 [10].
c.
Box contains [10].
d.
Box #0 contains [10].
Posted under Java Programming
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