请问哪里有问题？
public class HelloWorld{
public static void main(String[] args) {
String name="爱慕课";
Char sex='男';
Int num=18;
Double price=120.5;
Boolean isOK=true;
System.out.println(name);
System.out.println(sex);
System.out.println(num);
System.out.println(price);
System.out.println(isOK);
}
