java编程实现将1个4行3列的矩阵转置；

可以使用以下代码实现：

public class MatrixTranspose {
    public static void main(String[] args) {
        int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}};
        int[][] transposedMatrix = new int[matrix[0].length][matrix.length];

        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {
                transposedMatrix[j][i] = matrix[i][j];
            }
        }

        for (int i = 0; i < transposedMatrix.length; i++) {
            for (int j = 0; j < transposedMatrix[0].length; j++) {
                System.out.print(transposedMatrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}

这个程序会将一个4行3列的矩阵转置，输出结果为：

1 4 7 10 
2 5 8 11 
3 6 9 12