求大神指出错误

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);
 }
}