NumberFormatException的2个文本框的Java

Question

我想知道你将如何去输出其中的两个文本框拖住NumberFormatException异常。

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(); 


    } 

我的程序会比较两个数字，然后返回相加的数字的价值，但我需要这两个文本域的都扔回去异常输出，但我不知道如何做到这一点。我在代码中写过需要输出它的地方。

Answer 1

像这样的东西应该做的：

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));