Java 2D 字符串或数组列表？

Question

我有一个字符串数据集如下：

第 1 行：“abc”、“def”、“ghi”

第 2 行：“xyz”

第 3 行：“lmn”、“opq”、“rst”、“uvw”

首先，我想遍历每一行和每一列并在窗口中输出值。

我不确定如何执行此操作，因为每行都有不同的列数。

有人能告诉我在java中初始化这个数据集的最佳方法是什么吗？

谢谢

问候

Answer 1

First you need to decide how to parse your strings, are they different 1D arrays or all in a 2D array?  You could make a 2D array length the size of the largest array and test for nulls in the shorter ones... your simple loop would look something like this:
<code>
for (int i=0; i < 3; i++) { 
    for (int j=0; j< currentArray.length && currentArray[j] != NULL; j++) { 
        System.out.println(currentArray[i][j]);
    }
}
</code>

Answer 2

选项1：

    List<String[]> dataSet = new ArrayList<String[]>();

    dataSet.add(new String[] { "abc", "def", "ghi" });
    dataSet.add(new String[] { "xyz" });
    dataSet.add(new String[] { "lmn", "opq", "rst", "uvw" });

选项 2：

如果事先知道行数，也可以这样做：

    int numRows = 3; //if you know the number of rows in advance
    String[][] dataSet2 = new String[numRows][]; 

    dataSet2[0] = new String[] { "abc", "def", "ghi" };
    dataSet2[1] = new String[] { "xyz" };
    dataSet2[2] = new String[] { "lmn", "opq", "rst", "uvw" };