# Java Development Relevant Resource Collection **Repository Path**: zenny-chen/java-development-relevant-resource-collection ## Basic Information - **Project Name**: Java Development Relevant Resource Collection - **Description**: 我收藏的Java相关技术资料 - **Primary Language**: Unknown - **License**: GPL-3.0 - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2020-08-31 - **Last Updated**: 2022-05-30 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # Java Development Relevant Resource Collection 我收藏的Java相关技术资料
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## Java 9新增的语法特性概览 Java 9刚发布不久,新增的Java语法特性并不多,这里笔者感觉比较实用的就是允许在接口中定义私有成员方法,这样可以更方便地实现当前接口的模块性封装。下面我将展示一些简单的代码进行描述。 ```java package com.company; import org.jetbrains.annotations.Contract; interface MethodFunction { void call(int i); } interface MyInterface { public void hello(); @Contract(pure = true) private int method(int i) { return i + 1; } final int aa = 200; static MyInterface hi(MyInterface mi) { int x = aa + mi.method(50); System.out.println("Hi, there! x = " + x); return mi; } } public class Main { public static void main(String[] args) { // write your code here MyInterface.hi(new MyInterface() { @Override public void hello() { System.out.println("Hello, world!!"); } }).hello(); System.out.println("aa = " + MyInterface.aa); MethodFunction ref = (i) -> { System.out.println("This lambda param is: " + i); }; ref.call(100); ref = Main::Hello; ref.call(20); Main m = new Main(); ref = m::method; ref.call(10); } private static void Hello(int i) { System.out.println("i = " + i); } private void method(int i) { System.out.println("method i = " + i); } } ``` 上述代码比较简单,由于接口的私有成员方法只能作用于该接口自身,因此不能直接在实现它的类中进行直接访问。但我们可以通过在此接口中定义一个类方法,以对象传递的方式进行访问,这么一来正好可以形成针对当前接口的一种闭环设计。当然,**`private`** 也能修饰接口中的类方法。