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Topic: Tiger and enum

1.Tiger and enum

Posted by: zerol
Posted on: 2003-12-27 01:05

Hi all,
I downloaded jdk1.5( Tiger) and tried it to compile an
enum example in http://java.sun.com/features/2003/05/bloch_qa.html
but failed, anyone tell me why?
the two classes and compile time errors are listed below.
TIA.

public enum Coin {
penny(1), nickel(5), dime(10), quarter(25);

Coin(int value) { this.value = value; }

private final int value;

public int value() { return value; }
}

public class CoinTest {
public static void main(String[] args) {
for (Coin c : Coin.VALUES)
System.out.println(c + ": \t"
+ c.value() +"￠ \t" + color Coffee

);
}
private enum CoinColor { copper, nickel, silver }
private static CoinColor color(Coin c) {
switch Coffee

{
case Coin.penny: return CoinColor.copper;
case Coin.nickel: return CoinColor.nickel;
case Coin.dime:
case Coin.quarter: return CoinColor.silver;
default: throw new AssertionError("Unknown coin: " + c);
}
}
}

D:\j2sdk1.5.0\bin>javac -source 1.5 CoinTest.java
CoinTest.java:3: cannot find symbol
symbol : variable VALUES
location: class Coin
for (Coin c : Coin.VALUES)
^
CoinTest.java:10: an enum switch case label must be the unqualified name of an enumeration constant
case Coin.penny: return CoinColor.copper;
^
CoinTest.java:11: an enum switch case label must be the unqualified name of an enumeration constant
case Coin.nickel: return CoinColor.nickel;
^
CoinTest.java:11: duplicate case label
case Coin.nickel: return CoinColor.nickel;
^
CoinTest.java:12: an enum switch case label must be the unqualified name of an enumeration constant
case Coin.dime:
^
CoinTest.java:12: duplicate case label
case Coin.dime:
^
CoinTest.java:13: an enum switch case label must be the unqualified name of an enumeration constant
case Coin.quarter: return CoinColor.silver;
^
CoinTest.java:13: duplicate case label
case Coin.quarter: return CoinColor.silver;
^
8 errors

2.Re:Tiger and enum [Re: zerol]	Copy to clipboard
Posted by: toString Posted on: 2003-12-27 03:43 我这边也是一样有这个问题，不知道是不是Tiger alpha后来变了，而文档没有更新。因为采访Joshua bloch的那边文章是今年五月，已经过去七个月了。Anything might changed.

3.Re:Tiger and enum [Re: zerol]

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Posted by: 米国老
Posted on: 2003-12-29 15:39

改成下面这样就ok啦。

public class CoinTest {
public static void main(String[] args) {
for (Coin c : Coin.class.getEnumConstants())
System.out.println(c + ": \t"
+ c.value() +" Color \t" + color Coffee

);
}
private enum CoinColor { copper, nickel, silver }
private static CoinColor color(Coin c) {
switch Coffee

{
case penny: return CoinColor.copper;
case nickel: return CoinColor.nickel;
case dime:
case quarter: return CoinColor.silver;
default: throw new AssertionError("Unknown coin: " + c);
}
}
}

4.Re:Tiger and enum [Re: 米国老]	Copy to clipboard
Posted by: wsj Posted on: 2003-12-29 16:19 Yeah, got it worked. Thanks