將list集合，元素隨機打亂
阿新 • • 發佈：2018-11-10
- for迴圈+隨機數 實現相同位置的元素交換
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public <T> void shuffle(List<T> list) { int size = list.size(); Random random = new Random(); for(int i = 0; i < size; i++) { int randomPos = random.nextInt(size); T temp = list.get(i); list.set(i, list.get(randomPos)); list.set(randomPos, temp); } }
- Collections.swap實現
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public <T> void shuffle(List<T> list) { int size = list.size(); Random random = new Random(); for(int i = 0; i < size; i++) { int randomPos = random.nextInt(size); Collections.swap(list, i, randomPos); } }
Collections.shuffle實現
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public <T> void shuffle(List<T> list) { Collections.shuffle(list); }