如何在Java中制作没有任何for循环的String替换程序？

一种方法是使用流。和地图：

Map<Character, String> mapping = new HashMap<>();mapping.put('a', "one");mapping.put('e', "two");mapping.put('i', "three");mapping.put('o', "four");mapping.put('u', "five");String res = "Hello How are u!".chars()        .mapToObj(ch -> mapping.getOrDefault((char) ch,  Character.toString((char) ch)))        .collect(Collectors.joining());System.out.println(res);

那打印

Htwollfour Hfourw onertwo five!