java - 传入java的二维数组

Question

类文件:我使用 2d int 数组存储值，然后设置 setter 和 getter

public class SquareMatrix implements SquareMatrixInterface{
    int[][] squareMatrix; 

    public int[][] getSquareMatrix() {
        return squareMatrix;
    }

    public void setSquareMatrix(int[][] squareMatrix) {
        this.squareMatrix = squareMatrix;
    }
}

接口(interface)文件

public interface SquareMatrixInterface {
    public int[][] getSquareMatrix();
    public void setSquareMatrix(int[][] squareMatrix);
}

Main:我输入了一个值并尝试将值设置为 setter 但它给我错误

public class test {

    SquareMatrixInterface matrixA = new SquareMatrix();
    SquareMatrixInterface matrixB = new SquareMatrix();

    public static void main(String[] args) {
        int[][] m1 = {{1,2},{3,4}};
        matrixA.setSquareMatrix(m1);

    }
}

为什么当我尝试将数组传递给 setter 时出现错误 如何在不包含 Java 库的情况下传递二维数组

Answer 1

您无法访问 static block 内的 non static 属性。[无法对非静态字段进行静态引用]因此您需要将 main 方法重写为..

    public static void main(String[] args) {
        SquareMatrixInterface matrixA = new SquareMatrix();
        int[][] m1 = {{1, 2}, {3, 4}};
        matrixA.setSquareMatrix(m1);
    }

或

static SquareMatrixInterface matrixA = new SquareMatrix();

public static void main(String[] args) {
    int[][] m1 = {{1, 2}, {3, 4}};
    matrixA.setSquareMatrix(m1);
}