list拆分

        String[] str = new String[]{"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y"};

        List<String> list = Arrays.asList(str);
        //按组拆分
        int groupNum = 3;
        int size = list.size();
        int mod = size % groupNum;
        for(int i=0; i<groupNum; i++){
            List<String> strings = list.subList(size / groupNum * i, size / groupNum * (i + 1));
            System.out.println(strings);
        }
        if(mod != 0){
            List<String> strings = list.subList(size / groupNum * groupNum, size );
            System.out.println(strings);
        }

        System.out.println("=======================================");

        //按条数拆分
        int c = 7;
        int b = list.size() / c;
        int d = list.size() % c;

        for (int e = c; e <= c * b; e = e + c) {
            List<String> strings = list.subList(e - c, e);
            System.out.println(strings);
        }
        if (d != 0) {
            List<String> strings = list.subList(c * b, list.size());
            System.out.println(strings);
        }

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