JFrame GUI添加方法不起作用

Question

好吧我有一個接受文本輸入（比如說10）的GUI，然後你可以勾選你想添加到最初的數量（四個選項10,20,50,100）。之後，我試圖在另一個文本框架中顯示項目的總和。

int firstMuffler = Integer.parseInt(inputMufflers.getText()); 
    int firstTire = Integer.parseInt(inputTires.getText()); 
    int firstBreaks = Integer.parseInt(inputBreaks.getText()); 
    int firstMirrors = Integer.parseInt(inputMirrors.getText()); 
    if (Muf10.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 10)); 
    } 
    else if (Muf20.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 20)); 
    } 
    else if (Muf50.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 50)); 
    } 
    else if (Muf100.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 100)); 
    } 
    else if (T10.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 10)); 
    } 
    else if (T20.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 20)); 
    } 
    else if (T50.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 50)); 
    } 
    else if (T100.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 100)); 
    } 
    else if (B10.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 10)); 
    } 
    else if (B20.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 20)); 
    } 
    else if (B50.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 50)); 
    } 
    else if (B100.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 100)); 
    } 
    else if (M10.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors + 10)); 
    } 
    else if (M20.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors+ 20)); 
    } 
    else if (M50.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors + 50)); 
    } 
    else if (M100.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors + 100)); 
    }else{ 

    } 

這是我有什麼，我不明白是什麼使它不工作。因爲它只輸出FinalStockMuf文本框，其餘的不起作用。我也必須填補所有的東西，使其工作，如零。

注意：Muf10,T10等是複選框與這些值。 firstTire,firstMug等。是第一個輸入的價格，沒有選中任何複選框。

Answer 1

當您使用else if階梯時，您需要記住只有一個滿足要求的選項被執行。在你的例子中，你實現了負責從多個對象收集數據並將數據插入多個對象的代碼。實際上，滿足條件的第一個選項起作用，休息被忽略。因此，你應該這樣改變你的代碼：

if (Muf10.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 10)); 
    } 
    else if (Muf20.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 20)); 
    } 
    else if (Muf50.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 50)); 
    } 
    else if (Muf100.isSelected()){ 
     FinalStockMuf.setText(String.valueOf(firstMuffler + 100)); 
    } 

    //break and beginning of new else if structure, 

    if (T10.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 10)); 
    } 
    else if (T20.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 20)); 
    } 
    else if (T50.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 50)); 
    } 
    else if (T100.isSelected()){ 
     FinalStockT.setText(String.valueOf(firstTire + 100)); 
    } 

    //break and beginning of new else if structure, 

    if (B10.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 10)); 
    } 
    else if (B20.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 20)); 
    } 
    else if (B50.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 50)); 
    } 
    else if (B100.isSelected()){ 
     FinalStockB.setText(String.valueOf(firstBreaks + 100)); 
    } 

    //break and beginning of new else if structure, 

    if (M10.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors + 10)); 
    } 
    else if (M20.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors+ 20)); 
    } 
    else if (M50.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors + 50)); 
    } 
    else if (M100.isSelected()){ 
     FinalStockM.setText(String.valueOf(firstMirrors + 100)); 
    } 

它應該工作得很好。 下一個問題是NumberFormatException: For input string: ""，當任何輸入文本字段爲空時拋出。爲了解決這個我會用：

int firstMuffler = (!inputMufflers.getText().equals("")) ? Integer.parseInt(inputMufflers.getText()) : 0; 

...併爲每下一JTextField類似的解決方案。此代碼檢查JTextField是否爲空，如果是，則會向firstMuffler發送0值。但它不會填充JTextField'0'。

爲了填補輸出JTextField與股票或輸入和輸出JTextField的不修改的值「0」，如果沒有輸入，就足夠了，例如添加：

}else if(inputMufflers.getText().equals("")){ 
     inputMufflers.setText("0"); 
     FinalStockMuf.setText("0"); 
    }else{ 
     FinalStockMuf.setText(inputMufflers.getText()); 
    } 

每else if的端部分。 我希望你會發現我的答案有用。