独角兽企业重金招聘Python工程师标准>>>
1. Lambda语法的三种形式
(参数) -> 单行语句(参数) -> {多行语句}(参数) -> 表达式2. 注意
接口中使用，接口只定义一个接口方法外部变量被lambda表达式引用，编译器会隐式的把其当成final来处理3. 普通匿名内部类
// 函数式接口声明注解(只能定义一个方法)@FunctionalInterfaceinterface IMessage {void print();}public class LambdaDemo1 {public static void main(String... args) {fun(new IMessage() {@Overridepublic void print() {System.out.println("Hello World!"); // 核心代码就这一条}});}private static void fun(IMessage msg) {msg.print();}}
4. Lambda表达式
@FunctionalInterfaceinterface IMessage2 {void print();}public class LambdaDemo2 {public static void main(String... args) {fun(() -> System.out.println("Hello World!"));}private static void fun(IMessage2 msg) {msg.print();}}
5. 带参的Lambda表达式
@FunctionalInterfaceinterface IMessage2 {void print(String str);}public class LambdaDemo2 {public static void main(String... args) {// 首先要定义此处表达式里面需要接收变量，单行语句直接进行输出fun((s) -> System.out.println(s));}private static void fun(IMessage2 msg) {msg.print("Hello World");}}
6. 编写多行语句
@FunctionalInterfaceinterface IMessage2 {void print(String str);}public class LambdaDemo2 {public static void main(String... args) {// 首先要定义此处表达式里面需要接收变量，单行语句直接进行输出fun((s) -> {s = s.toUpperCase();System.out.println(s);});}private static void fun(IMessage2 msg) {msg.print("Hello World");}}
7. 编写一个表达式
@FunctionalInterfaceinterface IMessage2 {int add(int x, int y);}public class LambdaDemo2 {public static void main(String... args) {fun((x, y) -> x + y);}private static void fun(IMessage2 msg) {System.out.println(msg.add(10, 20));}}
如果觉得《JDK8新特性-Lambda表达式查找》对你有帮助，请点赞、收藏，并留下你的观点哦！
