| Methods Summary |
|---|
| public static java.util.Collection | fill(java.util.Collection c, int start, int size)
for(int i = start; i < start + size; i++)
c.add(Integer.toString(i));
return c;
|
| public static java.util.Collection | fill(java.util.Collection c, int size)
return fill(c, 0, size);
|
| public static java.util.Collection | fill(java.util.Collection c)
return fill(c, 0, 10);
|
| public static void | main(java.lang.String[] args)
Collection c = newCollection();
c.add("ten");
c.add("eleven");
print(c);
// Make an array from the List:
Object[] array = c.toArray();
// Make a String array from the List:
String[] str =
(String[])c.toArray(new String[1]);
// Find max and min elements; this means
// different things depending on the way
// the Comparable interface is implemented:
System.out.println("Collections.max(c) = " +
Collections.max(c));
System.out.println("Collections.min(c) = " +
Collections.min(c));
// Add a Collection to another Collection
c.addAll(newCollection());
print(c);
c.remove("3"); // Removes the first one
print(c);
c.remove("3"); // Removes the second one
print(c);
// Remove all components that are in the
// argument collection:
c.removeAll(newCollection());
print(c);
c.addAll(newCollection());
print(c);
// Is an element in this Collection?
System.out.println(
"c.contains(\"4\") = " + c.contains("4"));
// Is a Collection in this Collection?
System.out.println(
"c.containsAll(newCollection()) = " +
c.containsAll(newCollection()));
Collection c2 = newCollection(5, 3);
// Keep all the elements that are in both
// c and c2 (an intersection of sets):
c.retainAll(c2);
print(c);
// Throw away all the elements in c that
// also appear in c2:
c.removeAll(c2);
System.out.println("c.isEmpty() = " +
c.isEmpty());
c = newCollection();
print(c);
c.clear(); // Remove all elements
System.out.println("after c.clear():");
print(c);
|
| public static java.util.Collection | newCollection()
return fill(new ArrayList());
// ArrayList is used for simplicity, but it's
// only seen as a generic Collection
// everywhere else in the program.
|
| public static java.util.Collection | newCollection(int start, int size)
return fill(new ArrayList(), start, size);
|
| public static void | print(java.util.Collection c)
for(Iterator x = c.iterator(); x.hasNext();)
System.out.print(x.next() + " ");
System.out.println();
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