如何导入常量字段

Question

我想导入包含consts和类Constants中的常量。我有内部课程。

例如，我想使用表单Capability.DEVICE_NAME代替Constants.Capability.DEVICE_NAME

public class Constants {
    public class Capability{
        public final static String DEVICE_NAME = "deviceName";
        public final static String PLATFORM_NAME = "platformName";
        public final static String PLATFORM_VERSION = "platformVersion";
        public final static String APP_PACKAGE = "appPackage";
        public final static String APP_ACTIVITY = "appActivity";
    }
}

它必须在内部课程中！

提前感谢。

Answer 1

您必须按以下方式导入您的课程

import packageName.Constants.Capability;

您可以按照以下方式使用：

System.out.println(Capability.DEVICE_NAME);  

或者您可以将您的课程设为静态并导入如下。

import static com.Constants.*;

Answer 2

此import packagename.Constants.*;应该有效。

或者您可以使嵌套类静态

public class Constants {
    public static class Capability{
        public final static String DEVICE_NAME = "deviceName";
        public final static String PLATFORM_NAME = "platformName";
        public final static String PLATFORM_VERSION = "platformVersion";
        public final static String APP_PACKAGE = "appPackage";
        public final static String APP_ACTIVITY = "appActivity";
    }
}

并导入静态：

import static packagename.Constants.*;