I have this code:
int rev=0;
int opt=Integer.parseInt(JOptionPane.showInputDialog("How many numbers do you need?"));
for (int i=0; i<numbers; i++) {
int numbers=Integer.parseInt(JOptionPane.showInputDialog("Add your numbers"));
while (numbers != 0) {
rev=rev*10;
rev=rev+numbers%10;
numbers=numbers/10;
}
}
JOptionPane.showMessageDialog(null,"Your numbers are "+rev);
It works perfectly fine. I want the numbers to be reversed though. It does, but it has to be multiple numbers.
Example: Let's say I want 2 numbers: 123
, 456
the output would be 321654
My question is, if I want 3 numbers: 1
, 2
, 3
how do i make it so it would print 321
because it doesn't work if I add one digit numbers.
I'm sorry if it doesn't make sense or my question doesn't explain much.
Something like this should work (Its not tested)
String res="";
Integer opt=Integer.parseInt(JOptionPane.showInputDialog("How many numbers do you need?"));
for (int i=0; i<opt; i++) {
String numbers=JOptionPane.showInputDialog("Add your numbers");
res = new StringBuilder(numbers).reverse().toString() + res;
}
JOptionPane.showMessageDialog(null,"Your numbers are "+res);
Or this
String res="";
Integer opt=Integer.parseInt(JOptionPane.showInputDialog("How many numbers do you need?"));
for (int i=0; i<opt; i++) {
String numbers=JOptionPane.showInputDialog("Add your numbers");
res += numbers;
}
String reversedString = new StringBuilder(res).reverse().toString();
JOptionPane.showMessageDialog(null,"Your numbers are "+ reversedString);
您可以将这些数字放在ArrayList中,然后使用Collections.reverse(list)以相反的顺序获取它们。
You need to reverse each item's inner character order and then reverse the order in which the items were provided to you.
ArrayList<StringBuilder> reversedNumbers = new ArrayList<StringBuilder>();
for (/*your for loop condition here...*/) {
String sNumber = /*ask the user for a string here...*/
StringBuilder reversedNumber = new StringBuilder(sNumber).reverse();
reversedNumbers.add(reversedNumber);
}
Collections.reverse(reversedNumbers);/*finally reverse the colection*/
JOptionPane.showMessageDialog(null,"Your numbers are "+ reversedNumbers);
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