java 单独类中的枚举
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5262442/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
enum in separate class
提问by dsjoka
Is there anyway to put this test in a separate class? I tried but was unsuccessful.
反正有没有把这个测试放在一个单独的类中？我尝试过但没有成功。
public class TrafficLightprj
{
public enum TrafficLight
{
RED(1),
GREEN(2),
YELLOW(3);
private final int duration;
TrafficLight(int duration) {
this.duration = duration;
}
public int getDuration() {
return this.duration;
}
public static void main(String[] args)
{
for(TrafficLight light: TrafficLight.values())
{
System.out.println("The traffic light value is: " +light);
System.out.println("The duration of that trafic light value is: " + light.getDuration());
}
}
}
}
回答by JasCav
I'm not sure I understand what you mean in your question, so I'll answer to what I thinkyou are asking.
我不确定我是否理解你在问题中的意思，所以我会回答我认为你在问什么。
An enum can be its own file in Java. For example, you could have a file called TrafficLightwhich, inside, is:
在 Java 中，枚举可以是它自己的文件。例如，您可以有一个名为TrafficLight的文件，它的内部是：
public enum TrafficLight {
RED(1),
GREEN(2),
YELLOW(3);
private final int duration;
TrafficLight(int duration) {
this.duration = duration;
}
public int getDuration() {
return this.duration;
}
}
You then can use this enum from your test project (TrafficLightPrj.java). Like so:
然后，您可以使用测试项目 ( TrafficLightPrj.java) 中的枚举。像这样：
public class TrafficLightprj {
public static void main(String[] args) {
for(TrafficLight light: TrafficLight.values()) {
System.out.println("The traffic light value is: " +light);
System.out.println("The duration of that trafic light value is: " +light.getDuration());
}
}
}
回答by adarshr
You need to put it in a different .java file itself. You can't have more than one public class / enum in a single .java file.
您需要将它放在不同的 .java 文件中。在一个 .java 文件中不能有多个公共类/枚举。
TrafficLightprj.java
TrafficLightprj.java
public class TrafficLightprj {
public static void main(String[] args) {
for(TrafficLight light: TrafficLight.values()){
System.out.println("The traffic light value is: " +light);
System.out.println("The duration of that trafic light value is: " +light.getDuration());
}
}
}
TrafficLight.java
交通灯.java
public enum TrafficLight {
RED(1),
GREEN(2),
YELLOW(3);
private final int duration;
TrafficLight(int duration) {
this.duration = duration;
}
public int getDuration() {
return this.duration;
}
}
回答by Tom Hawtin - tackline
Sure, but you need to qualify the enum class name. TrafficLightprj.TrafficLightinstead of TrafficLight. Or, I guess, import it.
当然，但您需要限定枚举类名称。TrafficLightprj.TrafficLight而不是TrafficLight. 或者，我想，导入它。
I am not a big fan of non-private nested classes, and suggest making the enum top-level.
我不是非私有嵌套类的忠实粉丝，并建议将枚举设为顶级。
回答by Steven Jeuris
Assuming your question is: "How to get a nested enumin a different source file?"
假设您的问题是：“如何在不同的源文件中获取嵌套的枚举？”
This would be possible with partial classes, but this isn't supported in java.
这对于部分类是可能的，但在 java 中不受支持。
