11

PriorityQueue queue = new PriorityQueue<>(new Comparator() {
            @Override
            public int compare(Integer o1, Integer o2) {
                return 0;
            }
        });
        Arrays.sort(new int[]{});
        Arrays.sort(new String[]{});

        int[] irr = new int[]{1, 2, 3};
        List listA = new ArrayList<>();
        for (int i : irr) {
            listA.add(i);
        }

        String[] stra = new String[]{"1", "2", "3"};

        String s = String.join("-",stra);
        s.toLowerCase();
        s.toUpperCase();
        s.toCharArray();
        s.substring(0,1);
        StringBuilder ss = new StringBuilder();