在java中访问同一类但不同方法中的变量

Question

我是java新手，我有一些问题，很难从不同的方法，但在同一个类中访问一些变量

我的代码：

class upgradeSim {

    public static void main(String[] args) throws JSchException {

        System.out.print("\n[INFO]: Please enter the version you would like to upgarde to: ");
        Scanner inputVer = new Scanner(System.in);
        String uiVersion = inputVer.nextLine();
}

        public static void SendShhCmd() {
            //some code
        }


        public static void StartUpgrade() throws JSchException {    
            String cmd = ("SCP data/mdusr/perforce/automationtools/builds/ui/"+uiVersion);
        }
}

问题在于StartUpgrade方法无法识别uiVersion变量

我厌倦了使用“这个”和“超级”，但没有运气

谢谢你的帮助

Answer 1

将uiVersion声明为upgradeSim类的静态成员：

class upgradeSim {
    public static String uiVersion;

    public static void main(String[] args) throws JSchException {
        System.out.print("\n[INFO]: Please enter the version you would like to upgarde to: ");
        Scanner inputVer = new Scanner(System.in);
        uiVersion = inputVer.nextLine();
    }
    ...

    public static void StartUpgrade() throws JSchException {  
        // Now, 'uiVersion' is accessible  
        String cmd = ("SCP data/mdusr/perforce/automationtools/builds/ui/"+uiVersion);
    }
}

Answer 2

您应该创建一个名为uiVersion的全局变量，如下所示：

  class upgradeSim {

    static String uiVersion ;
   public static void main(String[] args) throws JSchException {

    ...
     uiVersion = inputVer.nextLine(); 
     ... 

Answer 3

uiVersionvaribale是本地的，只能在main方法中访问，所以您不能从StartUpgrade方法访问它。 将uiVersion声明为UpgradeSim类的静态成员

class UpgradeSim {
  private static String UI_VERSION; 

  public static void main(String[] args) throws JSchException {

    System.out.print("\n[INFO]: Please enter the version you would like to upgarde to: ");
    Scanner inputVer = new Scanner(System.in);
    UI_VERSION = inputVer.nextLine();
  }

  public static void SendShhCmd() {
        //some code
  }


  public static void StartUpgrade() throws JSchException {    
        String cmd = ("SCP   data/mdusr/perforce/automationtools/builds/ui/"+uiVersion);
     // use UI_VERSION;
  }
}

Answer 4

将uiVersion设置为类变量：

class upgradeSim {
    public static String uiVersion;

    etc.

}

在主方法中设置变量，如下所示：

uiVersion = inputVer.nextLine();