I made a program where when the user selects something from the JComboBox
a value will be placed in the JTextFields
along with TOTAL
and the user will input any number in the POINTS
field and the product of the values in the EARNING
field next to each of the TOTAL
& POINTS
fields will show.
But here only the product of the last two adjacent fields
is shown in each of the EARNING
fields.
I want:
200 * 1 = 200
100 * 2 = 200
200 * 4 = 800
100 * 6 = 600
But it always shows 600
the last product of two fields in each EARNING
fields.
Here a Screenshot is attached for better understanding.
My Code for counting multiplication is given below:
private void calcCredit() {
try {
double summation = 1;
int i = 0;
for (JTextField textField : arr) {
for(JTextField fields : arr1.subList(i, arr1.size())) {
summation = Double.parseDouble(textField.getText()) * Double.parseDouble(fields.getText());
}
i ;
}
for(JTextField f : arr2) {
f.setText(String.valueOf(summation));
}
} catch (Exception ex) {
}
}
Here all the JTextFields
under TOTAL
are added in an ArrayList
named arr
, all the JTextFields
under POINTS
are added in an ArrayList
named arr1
and the rest fields are added in ArrayList
named arr2
CodePudding user response:
I see that your code has the variable i
and you increment i
in the outer loop. I think you were thinking of using i
as index to the arrays. And this would be the right direction.
The solution is to use i to refer to the row of the three fields. For example, arr[i], arr1[i], arr2[i]
would refers to all the three fields on row i
. You need to compute the earning for each row and update the earning field for that row.
private void calcCredit() {
for(int i = 0; i<4; i ){
double total = Double.parseDouble(arr[i].getText());
double points = Double.parseDouble(arr1[i].getText());
double earning = total * points;
arr2[i].setText("" earning);
}
}