switch語句中嵌套類型

我groupPosition是0和childPosition爲1：

switch (groupPosition) { 
      case 0: 
       switch (childPosition) { 
        case 0: 
         if (NetworkManager.isNetworkAvailable(this)) { 
          new UserAwayTask().execute(); 
         } else 
          Toast.makeText(this, "Network not available", Toast.LENGTH_LONG).show(); 
         break; 

        case 1: 
         selection = null; 
         selectionArgs = null; 
         break; 
        case 2: 
         selection = Employee.COL_COUNTRY + " IS ? COLLATE NOCASE"; 
         selectionArgs = new String[]{valueReceived}; 
       } 
      case 1: 
       selection = Employee.COL_DEPARTMENT + " IS ? COLLATE NOCASE"; 
       selectionArgs = new String[]{valueReceived}; 
       break; 
      case 2: 
       empIDList = GetAllTeamLeaders.teamLeaders(this, TeamLeader.COL_TEAMMEMBERID, TeamLeader.COL_TEAMLEADERNAME + " IS ? ", new String[]{valueReceived}); 
       selection = Employee.COL_EMPID + " IN (" + TextUtils.join(",", Collections.nCopies(empIDList.size(), "?")) + ")"; 
       selectionArgs = empIDList.toArray(new String[empIDList.size()]); 
       break; 
     }

但每次我的選擇是：部門是什麼？ COLLATE NOCASE ，選擇參數來自外部開關的情況1。

所以這個：如果我評論外側開關的情況下，1和2的情況下

case 2: 
         selection = Employee.COL_COUNTRY + " IS ? COLLATE NOCASE"; 
         selectionArgs = new String[]{valueReceived};

但是我得到期望的結果：

case 1: 
       selection = Employee.COL_DEPARTMENT + " IS ? COLLATE NOCASE"; 
       selectionArgs = new String[]{valueReceived}; 
       break;

是越來越執行代替。

我在這裏錯過了什麼？

來源

2015-10-20 User3

你缺少break語句的情況下0： – arados

你需要在'情況下，'之開關語句後分號和'break' 0'或者它會在完成時直接進入'情況1'。 – lurker

你忘了添加break的頂級case 0：

case 0: 
    switch (childPosition) { 
     case 0: 
      if (NetworkManager.isNetworkAvailable(this)) { 
       new UserAwayTask().execute(); 
      } else 
       Toast.makeText(this, "Network not available", Toast.LENGTH_LONG).show(); 
      break; 

     case 1: 
      selection = null; 
      selectionArgs = null; 
      break; 
     case 2: 
      selection = Employee.COL_COUNTRY + " IS ? COLLATE NOCASE"; 
      selectionArgs = new String[]{valueReceived}; 
      break; 
    } 
break; //¯\_(ツ)_/¯

沒有break;，流量只是進行且進入下一case塊，直到達到break語句（或直至它熄滅的switch）。

而且，這不是壞主意，在將來增加一個break的嵌套case 2（萬一你添加更多case S和你可能最終得到了同樣的問題，因爲這一個，它的方式被稱爲跌破）。

來源

2015-10-20 12:22:50

我錯過了！恐怖！感謝隊友 – User3

通過，我不能用言語表達我多麼感激你:) – User3

不客氣。 :-) –

您不會從您的外部開關外殼0中斷。在內部開關的閉合支架上添加一個break。

case 0: 
    switch (childPosition) { 
    // 
    } break;

來源

2015-10-20 12:23:31

你缺少一休：

switch (groupPosition) { 
    case 0: 
     switch (childPosition) { 
      ... 
     } 
     break; // <-- here 
    case 1: 
     selection = Employee.COL_DEPARTMENT + " IS ? COLLATE NOCASE"; 
     selectionArgs = new String[]{valueReceived}; 
     break; 
    case 2: 
     empIDList = GetAllTeamLeaders.teamLeaders(this, TeamLeader.COL_TEAMMEMBERID, TeamLeader.COL_TEAMLEADERNAME + " IS ? ", new String[]{valueReceived}); 
     selection = Employee.COL_EMPID + " IN (" + TextUtils.join(",", Collections.nCopies(empIDList.size(), "?")) + ")"; 
     selectionArgs = empIDList.toArray(new String[empIDList.size()]); 
     break; 
}

來源

2015-10-20 12:24:12

switch語句中嵌套類型

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