import java.util.ArrayList;
import java.util.Scanner;
public class test {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter a number and when you are finished enter '=' ");
System.out.print("Enter the first number: ");
ArrayList<String> my_list = new ArrayList<String>();
String value = scanner.next();
int num = Integer.parseInt(value);
if (num == Integer.parseInt(value)) {
my_list.add(value);
} else {
System.out.print("Please enter a number");
}
while (!value.equals("=")) {
System.out.print("Enter a number: ");
value = scanner.next();
my_list.add(value);
my_list.remove("=");
}
System.out.println("The list looks like: ");
System.out.println(my_list);
backarryToNum(my_list);
}
public static void reverseArrayToNum(ArrayList number){
int num;
int sum = 0;
for (int i = number.size()-1; i >= 0 ; i--) {
int n = number.get(i);
num = n * (int)Math.pow(10,i);
sum += num;
System.out.println(sum);
}
}
}
问题是“ int n = number.get(i)”行。
reverseArrayToNum方法将使数组反向,并使反向的数字数组转换为数字。
答案 0 :(得分:2)
只是改变
Caption
到
int n = number.get(i);
否则,您尝试将String存储到int中。 而且,我想
int n = Integer.parseInt((String) number.get(i));
应该是
backarryToNum(my_list);