java - 如何在java中翻转句子中的两个单词

Question

如何在java中翻转句子中的两个单词

输入:“嗨，简，你今天过得怎么样”

输出:“今天你好吗，简”

我尝试过的:

String s = "hi how are you doing today jane";
    ArrayList<String> al = new ArrayList<>();

    String[] splitted = s.split("\\s+");
    int n = splitted.length;
    for(int i=0; i<n; i++) {
        al.add(splitted[i]);
    }
  for(int i=0; i<n-1; i=i+2) {
    System.out.print(al.get(i+1)+" "+al.get(i)+" ");
  }
  if((n%2) != 0) {
          System.out.print(al.get(n - 1));
      }

我得到的输出:"你今天过得怎么样"

Answer 1

正如您要求只使用一个循环并且不大量使用正则表达式一样，这是使用 Collections.swap 的另一种解决方案:

String s = "hi how are you doing today jane";
List<String> splitted = new ArrayList<>(List.of(s.split("\\s+")));

for(int i = 0; i < splitted.size() - 1; i += 2)
    Collections.swap(splitted, i, i + 1);
s = String.join(" ", splitted);
System.out.println(s);

输出:

how hi you are today doing jane