如何在java中创建动态二维数组？ [英] how to create dynamic two dimensional array in java?

问题描述

我想动态创建一个二维数组。

I want to create a two dimensional array dynamically.

我知道列数。但行数正在动态更改。我尝试了数组列表，但它只将值存储在单维度中。我该怎么办？

I know the number of columns. But the number of rows are being changed dynamically. I tried the array list, but it stores the value in single dimension only. What can I do?

推荐答案

由于列数是一个常数，你可以得到一个列表 int [] 。

Since the number of columns is a constant, you can just have an List of int[].

    import java.util.*;
    //...

    List<int[]> rowList = new ArrayList<int[]>();

    rowList.add(new int[] { 1, 2, 3 });
    rowList.add(new int[] { 4, 5, 6 });
    rowList.add(new int[] { 7, 8 });

    for (int[] row : rowList) {
        System.out.println("Row = " + Arrays.toString(row));
    } // prints:
      // Row = [1, 2, 3]
      // Row = [4, 5, 6]
      // Row = [7, 8]

    System.out.println(rowList.get(1)[1]); // prints "5"

由于它以列表，行数可以动态增长和缩小。每行都有一个 int [] 支持，这是静态的，但你说列数是固定的，所以这不是问题。

Since it's backed by a List, the number of rows can grow and shrink dynamically. Each row is backed by an int[], which is static, but you said that the number of columns is fixed, so this is not a problem.

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