I want to declare an empty array in java and then I want do update it but the code is not working

public class JavaConversion
{
    public static void main(String args[])
    {
        int array[]={};
        int number = 5, i = 0,j = 0;
        while (i<4) {
            array[i]=number;
            i=i+1;
        }
        while (j<4) {
            System.out.println(array[j]);
        }
    }
}