编写java程序实现矩阵加减乘的运算

好的，以下是一个简单的 Java 程序实现矩阵加减乘的运算：

public class Matrix {
    private int[][] data;
    private int rows;
    private int cols;

    public Matrix(int[][] data) {
        this.data = data;
        this.rows = data.length;
        this.cols = data[0].length;
    }

    public Matrix add(Matrix other) {
        if (this.rows != other.rows || this.cols != other.cols) {
            throw new IllegalArgumentException("Matrices must have the same dimensions");
        }

        int[][] result = new int[rows][cols];
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                result[i][j] = this.data[i][j] + other.data[i][j];
            }
        }

        return new Matrix(result);
    }

    public Matrix subtract(Matrix other) {
        if (this.rows != other.rows || this.cols != other.cols) {
            throw new IllegalArgumentException("Matrices must have the same dimensions");
        }

        int[][] result = new int[rows][cols];
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                result[i][j] = this.data[i][j] - other.data[i][j];
            }
        }

        return new Matrix(result);
    }

    public Matrix multiply(Matrix other) {
        if (this.cols != other.rows) {
            throw new IllegalArgumentException("Number of columns in first matrix must match number of rows in second matrix");
        }

        int[][] result = new int[this.rows][other.cols];
        for (int i = 0; i < this.rows; i++) {
            for (int j = 0; j < other.cols; j++) {
                int sum = 0;
                for (int k = 0; k < this.cols; k++) {
                    sum += this.data[i][k] * other.data[k][j];
                }
                result[i][j] = sum;
            }
        }

        return new Matrix(result);
    }
}

这个类中包含了三个方法，分别是 `add`、`subtract` 和 `multiply`，分别用于实现矩阵的加法、减法和乘法运算。这些方法都接受一个 `Matrix` 类型的参数，表示另一个矩阵，然后返回一个新的 `Matrix` 对象，表示运算的结果。