import java.util.*;
public class Main {
	public static double[][] integerToDoubleArray(Integer[][] integers) {
        double[][] doubles = new double[integers.length][];
        for (int i = 0; i < integers.length; i++) {
        	doubles[i] = new double[integers[i].length];
            for (int j = 0; j < integers[i].length; j++) {
                doubles[i][j] = integers[i][j];
            }
        }
        return doubles;
    }
    public static void main(final String[] args){
    	final Integer[][] arr = {{1,2}, {3,4}};
    	double[][] ans = integerToDoubleArray(arr);
    	System.out.println(Arrays.deepToString(arr));
    }
}

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