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]