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‎.gitignore‎

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@@ -22,4 +22,5 @@ build/
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nbbuild/
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dist/
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nbdist/
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.nb-gradle/
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.nb-gradle/
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/.idea

‎.idea/compiler.xml‎

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‎.idea/encodings.xml‎

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‎.idea/misc.xml‎

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‎.idea/vcs.xml‎

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‎.idea/workspace.xml‎

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‎pom.xml‎

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<dependencies>
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<!-- 微软office处理 api -->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi</artifactId>
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<version>3.6</version>
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</dependency>
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml</artifactId>
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<version>3.6</version>
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</dependency>
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml-schemas</artifactId>
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<version>3.6</version>
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</dependency>
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<!-- 微软office处理 api end -->
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<dependency>
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<groupId>org.apache.httpcomponents</groupId>
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<artifactId>httpclient</artifactId>
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<version>4.5.2</version>
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</dependency>
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<dependency>
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<groupId>commons-codec</groupId>
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<artifactId>commons-codec</artifactId>
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<version>1.6</version>
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</dependency>
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<dependency>
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<groupId>commons-httpclient</groupId>
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<artifactId>commons-httpclient</artifactId>
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<version>3.0.1</version>
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</dependency>
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>fastjson</artifactId>
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<version>1.2.49</version>
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</dependency>
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<!-- 数据验证框架 -->
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<dependency>
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<groupId>net.sf.oval</groupId>
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<artifactId>oval</artifactId>
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<version>1.81</version>
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</dependency>
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<dependency>
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<groupId>com.alibaba.external</groupId>
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<artifactId>xml.xstream</artifactId>
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<version>1.3.1</version>
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</dependency>
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<!-- 数据验证框架 end-->
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>3.6</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>

‎src/main/java/com/code/repository/study/classes/ClazzDemo.java‎

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package com.code.repository.study.classes;
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/**
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*
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* Class.forName(xxx.xx.xx) 返回的是一个类, .newInstance() 后才创建一个对象.
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*
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* Class.forName(xxx.xx.xx);的作用是要求JVM查找并加载指定的类，也就是说JVM会执行该类的静态代码段。
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*
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* @author zhaoyuan.lizy
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*
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*/
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public class ClazzDemo {
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// 父类A
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public class A{
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public void aa(){
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System.out.println("A");
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}
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}
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// 子类B
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public class B extends A{
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public void aa(){
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System.out.println("B");
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}
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}
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// 子类C
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public class C extends A{
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public void aa(){
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System.out.println("C");
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}
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}
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// 调用aa方法
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void showInnerClass(String name){
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try{
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A show=(A)Class.forName("com.alibaba.webx.study.my.classes."+name).newInstance();
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show.aa();
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}catch(Exception e){
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System.out.println ("showInnerClass Exception："+e);
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}
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}
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// 调用外部
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void show(String pathName){
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try {
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DemoA demo = (DemoA)Class.forName(pathName).newInstance();
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demo.aa();
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} catch (Exception e) {
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System.out.println ("show Exception："+e);
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}
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}
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public static void main(String[] args){
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ClazzDemo t=new ClazzDemo();
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t.showInnerClass("A");
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t.showInnerClass("B");
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t.showInnerClass("C");
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t.show("com.alibaba.webx.study.my.classes.DemoA");
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}
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}

‎src/main/java/com/code/repository/study/classes/DemoA.java‎

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package com.code.repository.study.classes;
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public class DemoA {
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static{ // Class.forName(xxx.xx.xx);调用该类时，JVM会执行该类的静态代码段。
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System.out.println("DemoA static method!");
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}
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public void aa(){
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System.out.println("DemoA");
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}
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}

‎src/main/java/com/code/repository/study/classloader/ClassLoaderStudy.java‎

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package com.code.repository.study.classloader;
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import java.net.URL;
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/**
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* classLoader基本概念的实践
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*
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* @author zhaoyuan.lizy
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* 2012-8-10下午1:57:27
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*/
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public class ClassLoaderStudy {
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public static void main(String[] args) {
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System.out.println(ClassLoader.getSystemClassLoader().getParent());
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System.out.println(ClassLoader.getSystemClassLoader().getParent().getParent());
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}
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/**
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* 获得系统属性
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*
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* @author zhaoyuan.lizy
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* 2012-8-15下午4:20:16
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*/
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private static void getProperty(){
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System.out.println("====查看bootstrapClassLoader加载的包");
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URL[] urls=sun.misc.Launcher.getBootstrapClassPath().getURLs();
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for (int i = 0; i < urls.length; i++) {
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System.out.println(urls[i].getFile());
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}
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//
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// System.out.println("\n====查看系统ClassPath包含的资源");
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// System.out.println(System.getProperty("java.class.path"));
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//
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// System.out.println("\n====查看Launcher的类加载器");
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// System.out.println("the Launcher's classloader is "+sun.misc.Launcher.getLauncher().getClass().getClassLoader());
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//
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// System.out.println("\n====加载该类的classLoader");
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// System.out.println(SimpleAction.class.getClassLoader().getClass().getName());
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//
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// System.out.println("\n====加载System的classLoader");
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// System.out.println(System.class.getClassLoader());
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//
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// System.out.println("\n====SystemClassLoader(AppClassLoader)的parent");
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// ClassLoader cl = ClassLoader.getSystemClassLoader();
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// System.out.println(cl);
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// System.out.println(cl.getParent());
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// System.out.println("\n====系统属性 java.ext.dirs");
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// System.out.println(System.getProperty("java.ext.dirs"));
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// System.out.println(System.getProperty("java.security.manager"));
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// System.out.println("\n====系统所有属性");
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// Properties p = System.getProperties();
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// for(Object s :p.keySet()){
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// System.out.println(s.toString()+"====>"+System.getProperty(s.toString()));
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// }
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}
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/**
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* 自定义classLoader，加载自定义的classPath
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*
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* @author zhaoyuan.lizy
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* 2012-8-15下午4:43:05
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*/
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private static void userClassLoader(){
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}
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}

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