Java锯齿数组 [英] Java Jagged Array

问题描述

我们的作业要求我们使用锯齿形数组来存储二维布尔矩阵的值.锯齿状数组是否有内置的Java类，还是我必须使用ArrayLists数组手动创建它?

Our homework assignment asks us to use a jagged array to store the values of a two dimensional boolean matrix. Is there a built in java class for the jagged array or am I going to have to manually create it with an Array of ArrayLists?

推荐答案

在Java中，二维数组是一维数组对象的数组.每个一维数组可以有不同的长度，这意味着您可以立即使用锯齿状的数组.

In Java, a 2D array is an array of 1D array objects. Each 1D array can have different length, which means that you get jagged arrays out of the box.

例如，以下是完全有效的Java，并打印出3 5 3 4:

For example, the following is perfectly valid Java, and prints out 3 5 3 4:

    int x[][] = {{0,1,2,3,4},{0,1,2},{0,1,2,3}};
    System.out.println(x.length);
    System.out.println(x[0].length);
    System.out.println(x[1].length);
    System.out.println(x[2].length);

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