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import java.util.function.Consumer; public class DemoConsumer { public static void main(String[] args) { //調(diào)用默認(rèn)方法 consumerString(s -> System.out.println(s)); //consumer接口的組合 consumerString( // toUpperCase()方法，將字符串轉(zhuǎn)換為大寫 s -> System.out.println(s.toUpperCase()), // toLowerCase()方法，將字符串轉(zhuǎn)換為小寫 s -> System.out.println(s.toLowerCase()) ); } private static void consumerString(Consumer<String> consumer) { consumer.accept("Hello"); } private static void consumerString(Consumer<String> first, Consumer<String> second) { first.andThen(second).accept("Hello"); } }