求大神指出錯(cuò)誤

public class HelloWorld{
??? public static void main(String[] args) {
?????? String name= "愛慕課";
?????? 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);
?}
}