Java嵌套列表到数组的转换 [英] Java nested list to array conversion

问题描述

将数据从嵌套列表转换为对象数组(可以用作JTable的数据)的最有效方法是什么?

What is the most efficient way to convert data from nested lists to an object array (which can be used i.e. as data for JTable)?

List<List> table = new ArrayList<List>();

for (DATAROW rowData : entries) {
    List<String> row = new ArrayList<String>();

    for (String col : rowData.getDataColumn())
        row.add(col);

    table.add(row);
}

// I'm doing the conversion manually now, but
// I hope that there are better ways to achieve the same
Object[][] finalData = new String[table.size()][max];
for (int i = 0; i < table.size(); i++) {
    List<String> row = table.get(i);

    for (int j = 0; j < row.size(); j++)
        finalData[i][j] = row.get(j);
}

非常感谢！

推荐答案

//defined somewhere
List<List<String>> lists = ....

String[][] array = new String[lists.size()][];
String[] blankArray = new String[0];
for(int i=0; i < lists.size(); i++) {
    array[i] = lists.get(i).toArray(blankArray);
}

我对JTable一无所知，但是只需几行就可以将列表列表转换为数组.

I don't know anything about JTable, but converting a list of lists to array can be done with a few lines.

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