将list集合，元素随机打乱

将list集合，元素随机打乱

三种实现方式

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);
}
}

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实现

public <T> void shuffle(List<T> list) {

Collections.shuffle(list);
}