NumberFormatException的2個文本框的Java

Question

我想知道你將如何去輸出其中的兩個文本框拖住NumberFormatException異常。

try 
    { 
     num1Convert = Integer.parseInt(num1Str); 
     num2Convert = Integer.parseInt(num2Str); 

     sumValue = num1Convert + num2Convert; 
     sumLabel.setText(sumText + Integer.toString(sumValue)); 
    } 
    catch(NumberFormatException nfe) 
    { 
     errorLabel.setText((HERE IS WHERE I NEED TO PUT CODE TO SAY WHICH TEXTFIELD IT IS" must be an integer"); 
     num1.requestFocus(); 


    } 

我的程序會比較兩個數字，然後返回相加的數字的價值，但我需要這兩個文本域的都扔回去異常輸出，但我不知道如何做到這一點。我在代碼中寫過需要輸出它的地方。

Answer 1

像這樣的東西應該做的：

String currentString = ""; 
try 
    { 
     currentString = num1Str; 
     num1Convert = Integer.parseInt(num1Str); 
     currentString = num2Str; 
     num2Convert = Integer.parseInt(num2Str); 

     sumValue = num1Convert + num2Convert; 
     sumLabel.setText(sumText + Integer.toString(sumValue)); 
    } 
    catch(NumberFormatException nfe) 
    { 
     // errorLabel.setText((HERE IS WHERE I NEED TO PUT CODE TO SAY WHICH TEXTFIELD IT IS" must be an integer"); 
     errorLabel.setText(currentString + " must be an integer"); 
     num1.requestFocus(); 

    } 

Answer 2

如何：

try{ 
     num1Convert = Integer.parseInt(num1Str); 
    } 
    catch(NumberFormatException nfe) { 
     System.out.println("Exception in num1"); 
    } 
    try{ 
     num2Convert = Integer.parseInt(num2Str); 
    } catch(NumberFormatException nfe) { 
     System.out.println("Exception in num2"); 
    } 

    //EDIT 

    sumValue = num1Convert + num2Convert; 
    sumLabel.setText(sumText + Integer.toString(sumValue));