解决二维数组转为ArrayList集合问题

1.修改前代码块

String[][] str = { { "语文", "100" }, { "英语", "90" }, { "数学", "90" }, };
    ArrayList<String> list = new ArrayList<String>();
    for (int i = 0; i < str.length; i++) {
        for (int j = 0; j < str[i].length; j++) {
            list.add(str[i][j]);
        }
    }
    System.out.println(list);

控制台输出结果： ”[语文, 100,英语, 90,数学, 90]”

2.修改后代码块

String[][] str = { { "语文", "100" }, { "英语", "90" }, { "数学", "90" } };
        ArrayList<String> list = null;
        ArrayList<ArrayList<String>> list2 = new ArrayList<ArrayList<String>>();
        for (int i = 0; i < str.length; i++) {
            list = new ArrayList<String>();
            for (int j = 0; j < str[i].length; j++) {
                list.add(str[i][j]);
            }
            list2.add(list);
        }
        Iterator it = list2.iterator();
        while (it.hasNext()) {
            System.out.println(it.next());
        }

控制台输出的结果为：
[语文, 100]
[英语, 90]
[数学, 90]