public static List<Integer> randomList(int n){ Random rand = new Random(); List<Integer> list = new ArrayList<>(); int i = 0; while (i < n) { int num = rand.nextInt(n); if (!list.contains(num)) { list.add(num); i++; } } return list; }
2、从已知列表中随机选取不同对象
public static List<Integer> randomList(int n,int size) { Random rand = new Random(); List<Integer> list = new ArrayList<>(); int i = 1; while (i <= n) { int num = rand.nextInt(size-1) + 1; if (!list.contains(num)) { list.add(num); i++; } } return list; }
3、把一个整数拆分成不等的几份
public static List<Integer> randomList(int n, int m){ Random rand = new Random(); List<Integer> list = new ArrayList<>(); int temp = m; for(int i = 0, j; i < n-1; i++){ j = rand.nextInt(temp-1) + 1; temp -= j; list.add(j); if (temp == 1){ break; } } list.add(temp); return list;}
