decimal to binary

public static void decToBin(int n){
    int binNum=0;
    int pow=0;
    while(n>0){
        int rem=n%2;
        binNum=binNum+(rem*(int)Math.pow(10,pow));
        pow++;
        n=n/2;
    }
    System.out.println(binNum);
    }
    public static void main(String args[]){
        decToBin(15);
    }