。但我有一個主要方法

Question

我想了解用xText和xPand生成dsl代碼。

我在eclipse中打開了statemachine xText例子，並作爲新的eclipse應用程序運行。然後，我在src中創建了一個包含test.statemachine文件的java，並將提供的代碼複製到其中。

下面的java文件，然後在src根文件夾中生成：

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 

public class testing { 

public static void main(String[] args) { 
    new testing().run(); 
} 

protected void doUnlockPanel() { 
    System.out.println("Executing command unlockPanel (PNUL)"); 
} 
protected void doLockPanel() { 
    System.out.println("Executing command lockPanel (PNLK)"); 
} 
protected void doLockDoor() { 
    System.out.println("Executing command lockDoor (D1LK)"); 
} 
protected void doUnlockDoor() { 
    System.out.println("Executing command unlockDoor (D1UL)"); 
} 

protected void run() { 
    boolean executeActions = true; 
    String currentState = "idle"; 
    String lastEvent = null; 
    while (true) { 
     if (currentState.equals("idle")) { 
      if (executeActions) { 
       doUnlockDoor(); 
       doLockPanel(); 
       executeActions = false; 
      } 
      System.out.println("Your are now in state 'idle'. Possible events are [doorClosed]."); 
      lastEvent = receiveEvent(); 
      if ("doorClosed".equals(lastEvent)) { 
       currentState = "active"; 
       executeActions = true; 
      } 
     } 
     if (currentState.equals("active")) { 
      if (executeActions) { 
       executeActions = false; 
      } 
      System.out.println("Your are now in state 'active'. Possible events are [drawOpened, lightOn]."); 
      lastEvent = receiveEvent(); 
      if ("drawOpened".equals(lastEvent)) { 
       currentState = "waitingForLight"; 
       executeActions = true; 
      } 
      if ("lightOn".equals(lastEvent)) { 
       currentState = "waitingForDraw"; 
       executeActions = true; 
      } 
     } 
     if (currentState.equals("waitingForLight")) { 
      if (executeActions) { 
       executeActions = false; 
      } 
      System.out.println("Your are now in state 'waitingForLight'. Possible events are [lightOn]."); 
      lastEvent = receiveEvent(); 
      if ("lightOn".equals(lastEvent)) { 
       currentState = "unlockedPanel"; 
       executeActions = true; 
      } 
     } 
     if (currentState.equals("waitingForDraw")) { 
      if (executeActions) { 
       executeActions = false; 
      } 
      System.out.println("Your are now in state 'waitingForDraw'. Possible events are [drawOpened]."); 
      lastEvent = receiveEvent(); 
      if ("drawOpened".equals(lastEvent)) { 
       currentState = "unlockedPanel"; 
       executeActions = true; 
      } 
     } 
     if (currentState.equals("unlockedPanel")) { 
      if (executeActions) { 
       doUnlockPanel(); 
       doLockDoor(); 
       executeActions = false; 
      } 
      System.out.println("Your are now in state 'unlockedPanel'. Possible events are [panelClosed]."); 
      lastEvent = receiveEvent(); 
      if ("panelClosed".equals(lastEvent)) { 
       currentState = "idle"; 
       executeActions = true; 
      } 
     } 
     if ("doorClosed".equals(lastEvent)) { 
      System.out.println("Resetting state machine."); 
      currentState = "idle"; 
      executeActions = true; 
     } 

    } 
} 

private String receiveEvent() { 
    System.out.flush(); 
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 
    try { 
     return br.readLine(); 
    } catch (IOException ioe) { 
     System.out.println("Problem reading input"); 
     return ""; 
    } 
} 
} 

然而，這將不好玩與錯誤「的編輯器不包含的主要類型」但從我可以看到這個存在

Answer 1

包含生成的testing.java的文件夾src-gen默認爲普通文件夾，而不是「源文件夾」。所以必須打開該文件夾的上下文菜單並選擇「Build Path」 - >「用作源文件夾」。之後，您可以執行Java程序。