字符串大小写转换
lambda方式: public class Consumer_andThen { private static void consumeString(String str, Consumer<String> one, Consumer<String> two) { one.andThen(two).accept(str); } public static void main(String[] args) { consumeString("Hello", s -> System.out.println(s.toUpperCase()), //转大写 s-> System.out.println(s.toLowerCase())); //转小写 } } 普通方式: public static void main(String[] args) { String s = "asdaggSASAD"; System.out.println(s.toUpperCase()); System.out.println(s.toLowerCase()); } 来源: CSDN 作者: 小龙虾X¥X个 链接: https://blog.csdn.net/weixin_41838029/article/details/104729042