.利用二维数组编程实现矩阵相乘、矩阵转置Java源代码

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以下是使用 Java 编写的二维数组实现矩阵相乘与矩阵转置的源代码：

矩阵相乘：

public class MatrixMultiplication {
    public static void main(String[] args) {
        int[][] matrixA = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
        int[][] matrixB = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
        int[][] result = multiply(matrixA, matrixB);
        printMatrix(result);
    }
    
    public static int[][] multiply(int[][] matrixA, int[][] matrixB) {
        int aRows = matrixA.length;
        int aCols = matrixA[0].length;
        int bRows = matrixB.length;
        int bCols = matrixB[0].length;
        
        if (aCols != bRows) {
            throw new IllegalArgumentException("The number of columns in matrix A must equal the number of rows in matrix B!");
        }
        
        int[][] result = new int[aRows][bCols];
        
        for (int i = 0; i < aRows; i++) {
            for (int j = 0; j < bCols; j++) {
                for (int k = 0; k < aCols; k++) {
                    result[i][j] += matrixA[i][k] * matrixB[k][j];
                }
            }
        }
        
        return result;
    }
    
    public static void printMatrix(int[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}

矩阵转置：

public class MatrixTranspose {
    public static void main(String[] args) {
        int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
        int[][] result = transpose(matrix);
        printMatrix(result);
    }
    
    public static int[][] transpose(int[][] matrix) {
        int rows = matrix.length;
        int cols = matrix[0].length;
        int[][] result = new int[cols][rows];
        
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                result[j][i] = matrix[i][j];
            }
        }
        
        return result;
    }
    
    public static void printMatrix(int[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}

希望能帮到你！