试图创建一个能够打印出双输出的二维数组，而不是仅 int 的 output。 我想让这个双打

Question

我试图理解为什么下面的程序不会打印数据类型 double 的数组，然后计算跟踪和正常。 该阵列旨在成为 5 x 5 阵列

    import java.io.*;  
public class Practice

{  
//size of the given matrix  
static double MAX = 10;  
//the method calculates and returns Normal of a matrix   
static double calculateNormal(double matrix[][], double n)  
{  
    double sum = 0;  
    for (double i=0; i<n; i++)  
        for (double j=0; j<n; j++)  
            sum = sum + matrix[i][j]*matrix[i][j];  
    return (double)Math.sqrt(sum);  
}  
//the method calculates and returns trace of a matrix  
static double calculateTrace(double matrix[][], double n)  
{  
    double sum = 0;  
    for (double i=0; i<n; i++)  
        sum = sum + matrix[i][i];  
    return sum;  
}  
//driver code  
public static void main (String args[])   
    {  
        //initializing matrix elements   
        double matrix[][] = {{17.5, -2.9, 9.8, -18.8, 14.5},  
                          {4.9, 11.6, -4.2, -8.6, -19.3},  
                          {-10.7, 14.5, -15.3, -16.9, 4.7},  
                          {-2.5, -4.4, 2.2, 13.7, -16.6},  
                          {4.2, -18.7, -3.9, -14.5, 16.8},  
                         };  
        System.out.println ("Trace of the give matrix is: "+ calculateTrace(matrix, 5));  
        System.out.println ("Normal of the given matrix is: "+ calculateNormal(matrix, 5));  
    }  
}