CODEWITHSUNDEEP
javaeclipse
user7182997
user7182997

Reputation:

The operator + is undefined for the argument type(s) java.lang.Double, java.lang.Double

i want to create a calculator .my code run in "cmd" successfully .but it didn't run in eclipse.it shows error in line 79."Double result =d1+d2;" here. error show that: The operator + is undefined for the argument type(s) java.lang.Double, java.lang.Double please help.

part of a class

    try{
        String s1 = txtFirst.getText(); String s2 = txtSecond.getText();
        Double d1= Double.valueOf(s1); 
        Double d2= Double.valueOf(s2);
        Double result = d1+d2 ; 
        String s = String.valueOf(result);
        txtResult.setText(s);
    }catch(Exception ex){
        JOptionPane.showMessageDialog(null, "Invalid Input", "Input Error", JOptionPane.INFORMATION_MESSAGE);
    }

Upvotes: 1

Views: 1487

Answers (2)

mohan rathour
mohan rathour

Reputation: 430

Which java version are you using ? because Autoboxing and Unboxing came in Java 5.0 If you are using old java version then you can't typecast directly.In that case you need to use below code

try{
    String s1 = txtFirst.getText(); String s2 = txtSecond.getText();
    double d1= Double.parseDouble(s1);
    double d2= Double.parseDouble(s2);
    double result = d1+d2 ; 
    String s = String.valueOf(result);
    txtResult.setText(s);
}catch(Exception ex){
    JOptionPane.showMessageDialog(null, "Invalid Input", "Input Error", JOptionPane.INFORMATION_MESSAGE);
}

Upvotes: 0

Abhishek Singh
Abhishek Singh

Reputation: 9188

You may be using old version of java which doesn't use AutoBoxing". Hence either upgarde java or use "double" instead of "Double" like this. 

try{
    String s1 = txtFirst.getText(); String s2 = txtSecond.getText();
    double d1= Double.parseDouble(s1);
    double d2= Double.parseDouble(s2);
    double result = d1+d2 ; 
    String s = String.valueOf(result);
    txtResult.setText(s);
}catch(Exception ex){
    JOptionPane.showMessageDialog(null, "Invalid Input", "Input Error", JOptionPane.INFORMATION_MESSAGE);
}

Upvotes: 1

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