Java根据正整数的位数并逆序打印出各位数字

importjava.util.Scanner;

publicclassEx24 {

publicstaticvoidmain(String[] args) {

  Ex24 tn =newEx24();

  Scanner s =newScanner(System.in);

  longa = s.nextLong();

  if(a<0|| a="">100000) {

  System.out.println("Error Input, please run this program Again");

  System.exit(0);

  }

  if(a >=0&& a <=9) {

  System.out.println( a +"是一位数");

  System.out.println("按逆序输出是"+'\n'+ a);

  }elseif(a >=10&& a <=99) {

  System.out.println(a +"是二位数");

  System.out.println("按逆序输出是");

  tn.converse(a);

  }elseif(a >=100&& a <=999) {

  System.out.println(a +"是三位数");

  System.out.println("按逆序输出是");

  tn.converse(a);

  }elseif(a >=1000&& a <=9999) {

  System.out.println(a +"是四位数");

  System.out.println("按逆序输出是");

  tn.converse(a);

  }elseif(a >=10000&& a <=99999) {

  System.out.println(a +"是五位数");

  System.out.println("按逆序输出是");

  tn.converse(a);

  }

}

publicvoidconverse(longl) {

  String s = Long.toString(l);

  char[] ch = s.toCharArray();

  for(inti=ch.length-1; i>=0; i--) {

  System.out.print(ch[i]);

  }

}

}