「Java」「enum」 Chapter4 Question16

Given:

enum TWMoney{
 Ten(10),Hundred(100),Thousand(1000);
 private int worth;
 public TWMoney(int i) {
  this.worth = i;
 }
 public int getWorth() {
  return worth;
 }
}
public class Test5 {
 public static void main(String[] args) {
  TWMoney curr = new TWMoney.Hundred;
  System.out.println(curr.getWorth());
 }
}

Answer:

enum列舉中，建構子必須是private。
所以修改為: public TWMoney(int i)

要實作列舉中的欄位，不可用new
修改為:  TWMoney curr = TWMoney.Hundred;