用用Java编写一个3x3矩阵，行列互换输出

以下是Java代码实现：

public class MatrixTranspose {
    public static void main(String[] args) {
        int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

        // 输出原始矩阵
        System.out.println("原始矩阵：");
        for (int[] row : matrix) {
            for (int num : row) {
                System.out.print(num + " ");
            }
            System.out.println();
        }

        // 行列互换
        int[][] transposedMatrix = new int[3][3];
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                transposedMatrix[j][i] = matrix[i][j];
            }
        }

        // 输出转置后的矩阵
        System.out.println("转置后的矩阵：");
        for (int[] row : transposedMatrix) {
            for (int num : row) {
                System.out.print(num + " ");
            }
            System.out.println();
        }
    }
}

输出结果如下：

原始矩阵：
1 2 3 
4 5 6 
7 8 9 
转置后的矩阵：
1 4 7 
2 5 8 
3 6 9