Java 二维数组

Question

矩阵引用的二维 boolean 值数组将用于模拟可容纳 LETTERS_PER_DISPLAY 字母的基于 LED 的显示器。

修改构造函数以创建一个具有 FONT_LETTER_HEIGHT 行和(FONT_LETTER_WIDTH 乘以 LETTERS_PER_DISPLAY)列的二维 boolean 数组，并将其分配给实例变量矩阵。

public class LEDDisplay
{
   private boolean[] = matrix;
   private static final int FONT_LETTER_HEIGHT = 5;
   private static final int FONT_LETTER_WIDTH = 6;
   private static final int LETTERS_PER_DISPLAY = 10;

public LEDDisplay()
{
    boolean[][] matrix = new boolean[FONT_LETTER_HEIGHT][FONT_LETTER_WIDTH]
}

请告诉我我的构造函数是否正确？

Answer 1

这实际上是不正确的 - 您通过定义构造函数的局部变量来隐藏成员变量矩阵。正确的做法是这样的:

public class LEDDisplay
{
   private boolean[][] matrix;
   private static final int FONT_LETTER_HEIGHT = 5;
   private static final int FONT_LETTER_WIDTH = 6;
   private static final int LETTERS_PER_DISPLAY = 10;

public LEDDisplay()
{
    matrix = new boolean[FONT_LETTER_HEIGHT][FONT_LETTER_WIDTH * LETTERS_PER_DISPLAY];
}