1-1000不包含4的所有正整数的和

public class Test3{
public static void main(String[] args){
int sum = 0;
for(int i=1;i<=1000;i++){
if(si(i)==true){
continue;
}
sum += i;
}
System.out.println(sum);
}
public static boolean si(int n){
return (n+"").contains("4");

}
}