Good day. I have been learning java the last few months. So I created a generic array as follows.
public class Implementation<T> implements IMatrix<T>{
private T[][] genMatrix;
private Integer numberRows;
private Integer NumberCols;
public Implementation(){
generateMatrix();
for(int i = 0;i< numberRows;i++)
{
for(int j =0;j< numberCols;j++)
{
JOptionPane.showInputDialog("Enter value for row " + (i+1) + " and for column " + (j+1)))
}
}
multiplyScalar(5);
}
//generate the array
public void generateMatrix(){
String rowString = JOptionPane.showInputDialog("Enter the number of rows!");
numberRows = Integer.parseInt(rowString);
String colString = JOptionPane.showInputDialog("Enter the number of cols!");
numberCols = Integer.parseInt(colString);
final Object[][] arrayO = (T[][])new Object[numberRows][numberCols];
genMatrix = (T[][])arrayO;
}
//writeElements to the array;
public void writeElem(int x, int y, T value){
genMatrix[x][y] = value;
}
//now that those members are done I have created a method to access the data
public T getElem(Integer i, Integer j){
return (T)genMatrix[i][j];
}
This is where my problem now exists. I have made this two dimensional array. I would like to multiply each value in this array by a Integer c. I have attempted it in the following way and all failed.
public IMatrix<T> multiplyScalar(Integer c) throws MatrixException {
// TODO Auto-generated method stub
for(int i = 0; i< numberRows; i++)
{
for(int j=0;j<numberCols;j++)
{
/**
THIS IS THE POINT AT WHICH IT CRASHES
*/
System.out.println(((Integer)(getElement(i, j)) * c));
}
}
return null;
}
}
The program crashes because of a ClassCastException. I have tried everything in my knowledge to get this to work. I can not multiply the two dimensional array with a Integer. Please help. This uses a interface with many more functions that is irrelevant. Please note that there is a strong possibility that this code crashes as I can not upload the original code.
