package oriented.API.StringUse.ArrayList.task.StudentManagementMenu;
import java.util.ArrayList;
import java.util.Random;
public class code {
public static void main(String[] args) {
ArrayList<Character> list = new ArrayList<>();
for (int i = 0; i < 26; i++) {
list.add((char)('a'+i));
list.add((char)('A'+i));
}
StringBuilder S = new StringBuilder();
Random random = new Random();
for (int i = 0; i < 4; i++) {
int index = random.nextInt(list.size());
Character c = list.get(index);
S.append(c);
}
System.out.println(S);
S.append(random.nextInt(10));
char [] a = S.toString().toCharArray();
int i = random.nextInt(a.length);
char c = a[i];
a[i] =a[a.length-1];
a[a.length-1] = a[i];
String s = new String (a);
System.out.println(s);
}
}