如何使用條件創建全局變量

Question

我想創建一個全局變量，但我希望它是基於機器操作系統的兩個值之一。 我想我可以通過編寫以下代碼來做到這一點：

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

但我收到一條錯誤消息，說“無法解析符號‘getProperty’ ”，我想要做的甚至可能嗎？

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