Get specific element from array in Java

问题

Basically I am trying to return an element from an 2d array in java. I have created a separate Matrix class and inside the class I want to write a get_element method which would take as input the coordinates of the element I want from the matrix and the matrix itself, however I am not sure how to do this.

public static double get_element(Matrix A, double m , double n)
{  
    for(int i=0;i<A.rows;i++)
        for(int j=0;j<A.cols;j++)
           return A.data[m][n];


}

This is how my code look right now. And I get an error that says lossy conversion between double and int.

回答1:

You don't need the loop. Also, you need to convert the double to int

return A.data[(int) m][(int) n];

Alternatively (better), you change the method signature:

public static double get_element(Matrix A, int m , int n) {  
    return A.data[m][n];
}

来源：https://stackoverflow.com/questions/55226963/get-specific-element-from-array-in-java