scjp考试准备 - 6

class Person{ 
    String name = "No name"; 
    public Person(String nm){name = nm;} 
} 

class Employee extends Person{ 
    String empID = "0000"; 
    public Employee(String id){empID = id;} 
} 

class EmployeeTest{ 
    public static void main(String[] args){ 
        Employee e = new Employee("4321"); 
        System.out.println(e.empID); 
    } 
}

class Atom{ 
    Atom(){System.out.print("atom ");} 
} 
class Rock extends Atom{ 
    Rock(String type){System.out.print(type);} 
} 
public class Mountain extends Rock{ 
    Mountain(){ 
        super("granite "); 
        new Rock("granite "); 
    } 
    public static void main(String[] a){new Mountain();} 
}

1.  class Super{ 
2.   private int a; 
3.   protected Super(int a){this.a = a;} 
4.  } 
...  
11.  class Sub extends Super{ 
12.   public Sub(int a){super(a);} 
13.   public Sub(){this.a = 5;} 
14.  }

A.  Change line 2 to: 
     public int a; 
B.  Change line 2 to: 
     protected int a; 
C.  Change line 13 to: 
     public Sub(){this(5);} 
D.  Change line 13 to: 
     public Sub(){super(5);} 
E.  Change line 13 to: 
     public Sub(){super(a);}