小例子
public class Main { public static void main(String[] args) { // 使⽤双冒号::来构造静态函数引⽤ Function<String, Integer> fun = Integer::parseInt; Integer value = fun.apply("1024"); System.out.println(value); // 使⽤双冒号::来构造⾮静态函数引⽤ String content = "欢迎来到⼩滴课堂学习"; Function<Integer, String> func = content::substring; String result = func.apply(1); System.out.println(result); // 构造函数引⽤,多个参数 BiFunction<String, Integer, User> biFunction = User::new; User user1 = biFunction.apply("⼩滴课堂", 28); System.out.println(user1.toString()); //构造函数引⽤,单个参数 Function<String, User> function = User::new; User user2 = function.apply("⼩D"); System.out.println(user2.toString()); // 函数引⽤也是⼀种函数式接⼝,可以将函数引⽤作为⽅法的参数 sayHello(String::toUpperCase, "xdclass.net"); } /** * @param func 函数引⽤ * @param param 对应的参数 */ private static void sayHello(Function<String, String> func, String param) { String result = func.apply(param); System.out.println(result); } } class User { private String username; private Integer age; public User() { } public User(String username) { this.username = username; } public User(String username, Integer age) { this.username = username; this.age = age; } }
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