java - 从方法返回二维数组

Question

我试图从类内部的函数返回一个二维数组。我不想在函数内创建新数组，因为我想返回传递给函数的相同数组。

我尝试创建一个具有相同名称的新数组，但它说它已经在范围内定义。我也尝试过只执行 (returnplane;) ，但由于数据类型不兼容，这不起作用。我也尝试过(返回平面[][];)，但这也不起作用。

public class Airplane {
    private String maxSeats; //used for constructor
    private char[][] plane = new char[13][6]; //array to be passed in

 public char create(char[][] plane) {
       plane[13][6]; //this is where I'm unsure what to do
        //initialize them as '*' to start
        for (int i = 0; i <= 12; i++) {
            for ( int k = 0; k <= 5; k++) {
                 plane[i][k] = '*';
            }
return plane;
        }
}

我正在尝试返回要在另一个函数中使用的数组，我将在其中修改它。

Answer 1

您必须将返回类型更改为char[][]，因为您想要返回二维字符数组而不仅仅是单个字符

public class Airplane {
        private String maxSeats;
        private char[][] plane = new char[13][6];

        public char[][] create(char[][] plane) {

            // plane[13][6]; you should remove this line, it's the wrong syntax 
           //and it's unneeded since you've already declared this array

            // this is a more compact version of your nested loop
            for (int i = 0; i < 13; i++) {
                Arrays.fill(plane[i], '*'); //fills the whole array with the same value
            }

            return plane;

        }
    }