下面代码输出结果是（ ）
public static void main(String[] args) {
System.out.println(add(5));
}
public static String add(float num){
return "float";
}
public static String add(double num){
return "double";
}
public static String add(short num){
return "short";
}
public static String add(long num){
return "long";
}