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Commit 5aa6a77

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module-info 中static 关键字解读
1 parent ba91c1c commit 5aa6a77

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java9-action-static</artifactId>
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<groupId>com.dockerx.traffic</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>dockerx-traffic-static-entity</artifactId>
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</project>
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package com.dockerx.traffic.optional.anno;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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import static java.lang.annotation.ElementType.TYPE;
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/**
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* @author Author 知秋
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* @email fei6751803@163.com
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* @time Created by Auser on 2017年11月21日 13:30.
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*/
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@Retention(RetentionPolicy.RUNTIME)
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@Target(value={TYPE})
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public @interface Anno {
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boolean value() default true;
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}
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package com.dockerx.traffic.optional.entity;
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import com.dockerx.traffic.optional.anno.Anno;
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/**
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* @author Author 知秋
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* @email fei6751803@163.com
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* @time Created by Auser on 2017年11月20日 20:11.
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*/
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@Anno
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public class Person {
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private int mileage;
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private int money;
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public Person() {
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}
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public Person(int mileage, int money) {
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this.mileage = mileage;
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this.money = money;
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}
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public int getMileage() {
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return mileage;
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}
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public Person setMileage(int mileage) {
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this.mileage = mileage;
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return this;
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}
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public int getMoney() {
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return money;
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}
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public Person setMoney(int money) {
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this.money = money;
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return this;
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}
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}
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/**
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* @author Author 知秋
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* @email fei6751803@163.com
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* @time Created by Auser on 2017年11月21日 13:29.
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*/
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module dockerx.traffic.optional.entity {
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exports com.dockerx.traffic.optional.entity;
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exports com.dockerx.traffic.optional.anno;
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java9-action-static</artifactId>
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<groupId>com.dockerx.traffic</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>dockerx-traffic-static-gui</artifactId>
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<dependencies>
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<dependency>
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<groupId>com.dockerx.traffic</groupId>
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<artifactId>dockerx-traffic-static-entity</artifactId>
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<version>1.0-SNAPSHOT</version>
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</dependency>
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</dependencies>
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</project>
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package com.dockerx.traffic.optional.gui;
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import com.dockerx.traffic.optional.anno.Anno;
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/**
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* @author Author 知秋
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* @email fei6751803@163.com
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* @time Created by Auser on 2017年11月21日 14:31.
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*/
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@Anno
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public class Bike {
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}
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package com.dockerx.traffic.optional.gui;
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import com.dockerx.traffic.optional.entity.Person;
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/**
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* @author Author 知秋
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* @email fei6751803@163.com
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* @time Created by Auser on 2017年11月21日 13:37.
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*/
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public class Gui {
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public static void main(String[] args) {
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//module-info.java 文件中使用static修饰后,会在编译阶段直接忽略这个类,不会加载到文件系统中,
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// 不过想要使用可以通过反射获取,我们有requires的
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// 下面注释掉的两条语句都会报ClassNotFoundException
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/*Person person = new Person(100, 1);
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System.out.println(Person.class.getAnnotations().length);*/
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System.out.println(Bike.class.getAnnotations().length);
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System.out.println("Running without annotation @Anno present.");
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try {
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Class<?> clazz = Class.forName("com.dockerx.traffic.optional.entity.Person");
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Person instance =
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(Person) clazz.getConstructor().newInstance();
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instance.setMileage(10);
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//同样,添加下面注释这句,就会报下面catch到的错了
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// System.out.println(Person.class.getAnnotations().length);
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System.out.println("Using Person");
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} catch (ReflectiveOperationException e) {
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System.out.println("Oops, we need a fallback!");
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}
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}
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}
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/**
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* @author Author 知秋
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* @email fei6751803@163.com
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* @time Created by Auser on 2017年11月21日 13:37.
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*/
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module dockerx.traffic.optional.gui {
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requires static dockerx.traffic.optional.entity;
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.dockerx.traffic</groupId>
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<artifactId>java9-action-static</artifactId>
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<packaging>pom</packaging>
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<version>1.0-SNAPSHOT</version>
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<modules>
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<module>dockerx-traffic-optional-entity</module>
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<module>dockerx-traffic-optional-gui</module>
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</modules>
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<properties>
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<java.version>1.9</java.version>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.6.1</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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<showDeprecation>true</showDeprecation>
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<showWarnings>true</showWarnings>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

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