Integer to Roman

public class Solution {
public String intToRoman(int num) {
char[] sym = {'I','V','X','L','C','D','M'};
int scale = 1000;
StringBuilder sb = new StringBuilder();
for(int i=6;i>=0;i=i-2){
int digit = num/scale;
if(digit>0){
if(digit<=3){
for(int j=0;j<digit;j++){
sb.append(sym[i]);
}
}
else if(digit==4){
sb.append(sym[i]);
sb.append(sym[i+1]);
}
else if(digit==5){
sb.append(sym[i+1]);
}
else if(digit<=8){
sb.append(sym[i+1]);
for(int j=0;j<digit-5;j++)
sb.append(sym[i]);
}
else if(digit==9){
sb.append(sym[i]);
sb.append(sym[i+2]);
}
}
num %= scale;
scale /=10;
}
return sb.toString();
}
}