public class Car { 
private int wheelCount； 
private String vin； 
public Car（String vin） { 
this.vin = vin； 
this.wheelCount = 4； 
} 
public String drive（） { 
return “zoom-zoom”； 
} 
public String getInfo（） { 
return “VIN： “+ vin + “wheels： “+ wheelCount； 
} 
} 
And： 
public class MeGo extends Car { 
public MeGo（String vin） { 
this.wheelCount = 3； 
} 
} 
What two must the programmer do to correct the compilation errors？（）

10. public class Hello { 
11. String title； 
12. int value； 
13. public Hello（） { 
14. title += “ World”； 
15. } 
16. public Hello（int value） { 
17. this.value = value； 
18. title = “Hello”； 
19. Hello（）； 
20. } 
21. } 
and： 
30. Hello c = new Hello（5）； 
31. System.out.println（c.title）； 
What is the result？（）