題目要求：給定n行的英文句子，要求輸出句子中逆序單詞後的句子，如:

輸入：n=3

I love you

How are you

My name is Liming

輸出：

you love I

you are How

Liming is name My

依據Java語言給我們提供的拆分空格間隔的單詞的方法(split(" "))，倒序輸出即可;

import java.util.Scanner;
public class Main {
	public static String reverseWords(String sentence) {
	    StringBuilder sb = new StringBuilder(sentence.length() + 1);
	    String[] words = sentence.split(" ");
	    for (int i = words.length - 1; i >= 0; i--) {
	        sb.append(words[i]).append(' ');
	    }
	    sb.setLength(sb.length() - 1); 
	    return sb.toString();
	}
	public static void main(String[] args) throws UnsupportedEncodingException {
		Scanner  in= new Scanner(System.in);
	    System.out.printf("Please input how many lines you want to enter: ");        
	    String[] input = new String[in.nextInt()];
	    in.nextLine(); 
	    for (int i = 0; i < input.length; i++) {
	        input[i] = in.nextLine();
	    }
	    System.out.printf("\nYour input:\n");
	    for (String s : input) {
	        System.out.println(reverseWords(s));
	    }
	    }
	}