SCJP 1.6版考題 044

1. class Employee{
2.   String name; double baseSalary;
3.     public Employee(String name, double baseSalary){
4.     this.name = name;
5.     this.baseSalary = baseSalary;
6.   }
7. }
8. public class SalesPerson extends Employee{
9.   double commission;
10.  public SalesPerson(String name,
11.      double baseSalary, double commission){
12.    //insert code here
13.  }
14.}


Which two code fragments, inserted independently at line 12, will compile? (Choose two.)

  A. super(name, baseSalary);
  B. this.commission = commission;
  C. super();
     this.commission = commission;
  D. this.commission = commission;
     super();
  E. super(name, baseSalary);
     this.commission = commission;
  F. this.commission = commission;
     super(name, baseSalary);
  G. super(name, baseSalary, commission);

解答

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Ans:A E

解說:

由於父類別Employee沒有“無參數”的建構子，所以本程式要能編譯，必須要避免編譯器為SalesPerson的建構子加上super()，
於是就加A/E，加上明確的呼叫父類別的建構子Employee(String name, double baseSalary)