主要利用split函数分割字符串

public class Main{
	public static void main(String[] args){		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String[] res = str.split(" ");
		for(int i=res.length-1;i>=0;i--){
			System.out.print(res[i]);
			if(i!=0)System.out.print(" ");
		}
	}
}