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implement Collections.shuffle

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This commit is contained in:
Joel Dice 2009-03-04 08:18:18 -07:00
parent 8659c709b7
commit 1d04fed6de
1 changed files with 19 additions and 0 deletions
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19
classpath/java/util/Collections.java
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@ -13,6 +13,25 @@ package java.util;
public class Collections {
private Collections() { }
public static void shuffle(List list, Random random) {
Object[] array = toArray(list, new Object[list.size()]);
for (int i = 0; i < array.length; ++i) {
int j = random.nextInt(array.length);
Object tmp = array[i];
array[i] = array[j];
array[j] = tmp;
}
list.clear();
for (int i = 0; i < array.length; ++i) {
list.add(array[i]);
}
}
public static void shuffle(List list) {
shuffle(list, new Random());
}
static <T> T[] toArray(Collection collection, T[] array) {
Class c = array.getClass().getComponentType();