what's the problem?
package com.codegym.task.task09.task0930;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
/*
Task about algorithms
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
ArrayList<String> list = new ArrayList<>();
while (true) {
String s = reader.readLine();
if (s.isEmpty()) break;
list.add(s);
}
String[] array = list.toArray(new String[list.size()]);
sort(array);
for (String x : array) {
System.out.println(x);
}
}
public static void sort(String[] array) {
// write your code here
for (int i = array.length-1; i > 0; i--) {
String a = array[i].toLowerCase();
if (isNumber(a)) {
for (int j = 0; j < i; j++) {
String b = array[j];
if (isNumber(b)) {
int an = Integer.parseInt(array[i]);
int bn = Integer.parseInt(array[j]);
if (an > bn) {
String c = array [i];
array [i] = array [j];
array [j] = c;
}
}
}
}
else {
for (int j = 0; j < i; j++) {
String b = array[j].toLowerCase();
if (!isNumber(b)) {
if (isGreaterThan(b, a)) {
String temp = array[i];
array[i] = array[j];
array[j] = temp;
//break;
}
}
}
}
}
}
// String comparison method: 'a' is greater than 'b'
public static boolean isGreaterThan(String a, String b) {
return a.compareTo(b) > 0;
}
// Is the passed string a number?
public static boolean isNumber(String s) {
if (s.length() == 0) return false;
char[] chars = s.toCharArray();
for (int i = 0; i < chars.length; i++) {
char c = chars[i];
if ((i != 0 && c == '-') // The string contains a hyphen
|| (!Character.isDigit(c) && c != '-') // or is not a number and doesn't start with a hyphen
|| (i == 0 && c == '-' && chars.length == 1)) // or is a single hyphen
{
return false;
}
}
return true;
}
}