如何使用条件创建全局变量

Question

我想创建一个全局变量，但我希望它是基于机器操作系统的两个值之一。 我想我可以通过编写以下代码来做到这一点：

import java.lang.*;
import java.util.Properties;

public class constants {
    public static String driverFile = null;
    public static String storageDirectory = null;
        if (System.getProperty("os.name").startsWith("Windows")){
        storageDirectory = "C:\\Scripts\\Price_Tracker";
        driverFile = "geckodriver-v0.27.0-win64.exe";
    }else{//is linux
        storageDirectory = "/Price_Tracker";
        driverFile = "geckodriver-v0.27.0-linux64";
    }// end if(System.getProperty("os.name").startsWith("Windows")

}//end public class constants

但我收到一条错误消息，说“无法解析符号‘getProperty’ ”，我想要做的甚至可能吗？

Answer 1

public class constants {
    public static String driverFile = null;
    public static String storageDirectory = null;

    static {
        if (System.getProperty("os.name").startsWith("Windows")){
            storageDirectory = "C:\\Scripts\\Price_Tracker";
            driverFile = "geckodriver-v0.27.0-win64.exe";
        }else{//is linux
            storageDirectory = "/Price_Tracker";
            driverFile = "geckodriver-v0.27.0-linux64";
        }// end if(System.getProperty("os.name").startsWith("Windows")
    }

}//end public class constants