题解 | #字符逆序#

import java.util.*; public class Main { public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine(); char[] chars = str.toCharArray(); for(int i=0;i<chars.length;i++){ if(!(chars[i]>='a'&&chars[i]<='z')&&
                    !(chars[i]>='A'&&chars[i]<='Z')){
                chars[i]=' ';
            }
        }
        StringBuffer sb = new StringBuffer(chars[0]+""); for(int i=1;i<chars.length;i++){ if((chars[i]!=' ')|| (chars[i]==' '&&sb.charAt(i-1)!=' ')){
                sb.append(chars[i]);
            }
        }
       String strs  = sb.toString();
        String[] strArray = strs.split(" ");
        StringBuffer stringBuffer = new StringBuffer(); for (int i = strArray.length-1; i >=0 ; i--) {
            stringBuffer.append(strArray[i]+" ");
        }
        System.out.println(stringBuffer.substring(0,stringBuffer.toString().length()-1));

    }
}