java - 在 Java 中交换单词

Question

我是 Java 新手，想交换两个输入到程序中然后保存为字符串的单词。我包含了一个 if 语句，以确保输入了我要切换的两个单词。

  Scanner in = new Scanner(System.in);
  System.out.println("Please enter at least one thing you love and one thing you hate using the words hate and love: ");
  String loveHate = in.nextLine();



  if (loveHate.indexOf( "love" ) == -1 || loveHate.indexOf( "hate" ) == -1 ){
    System.out.println("Please include the words love and hate.");
    return; 
  }

我想取用户输入的句子并切换爱和恨这两个词，然后用切换的词重新打印一个新字符串。

Answer 1

一种粗略的方法，前提是您不希望输入中的文本“xxxx”是标准交换：

...
String loveHate = in.nextLine();

String hateLove = loveHate.replaceAll("love", "xxxx");
       hateLove = hateLove.replaceAll("hate", "love");
       hateLove = hateLove.replaceAll("xxxx", "hate");

System.out.println("Changed "+loveHate+" into "+hateLove);