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java的impl

时间: 2023-10-20 13:15:03 浏览: 245
"impl" 是 "implementation" 的缩写,通常用于指代某个接口的具体实现类。在 Java 中,我们可以使用关键字 `implements` 来实现一个接口,并提供该接口中所有未实现的方法的具体实现。例如: ``` public interface MyInterface { void myMethod(); } public class MyInterfaceImpl implements MyInterface { public void myMethod() { System.out.println("Hello World!"); } } ``` 在上面的代码中,`MyInterfaceImpl` 类实现了 `MyInterface` 接口,并提供了该接口中定义的 `myMethod()` 方法的具体实现。这样,我们就可以通过 `MyInterface` 接口来调用 `MyInterfaceImpl` 类中实现的 `myMethod()` 方法,例如: ``` MyInterface myInterface = new MyInterfaceImpl(); myInterface.myMethod(); // 输出 "Hello World!" ```
相关问题

java impl是什么

"java impl" 是 "Java implementation" 的缩写,意为 "Java 实现"。在编程领域中,Java 实现可以指 Java 虚拟机(JVM)的不同实现,或者是基于 Java 语言的不同框架、库、应用程序的实现。不同的 Java 实现可能会有不同的特性、性能、稳定性等方面的差异。常见的 Java 实现包括 Oracle JDK、OpenJDK、IBM J9、Apache Harmony 等。

java impl类中的方法如何覆写使用

在Java中,要让impl类中的方法覆写父类或接口中的方法,你需要遵循以下步骤: 1. **继承**:首先,创建一个impl类,让它继承自需要覆盖方法的那个父类。例如,`public class ImplClass extends ParentClass`。 2. **声明方法**:在impl类中声明你要重写的方法,方法名、返回类型和参数列表都必须与父类中被覆盖的方法完全一致。例如: ```java public class ImplClass { // 如果父类的方法是public,则impl类中的方法也可以保持public,如果是protected则应保持不变 @Override public returnType methodToOverride(paramType param1, paramType param2) { // 你的具体实现代码 } } ``` 3. **@Override注解**:为了明确告诉编译器这是一个重写操作,应在方法上添加`@Override`注解,如上面的代码所示。 4. **调用父类方法**:在覆写方法内部,你可以选择保留或覆盖父类的方法体,如果想要在子类方法中调用原方法,可以使用`super.methodName()`。 5. **运行时行为**:由于是动态绑定(Dynamic Dispatch),当你通过父类型的引用调用方法时,会根据实际的对象类型来执行相应子类的方法。
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/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home/bin/java -Dmaven.multiModuleProjectDirectory=/Users/remin/Desktop/webrme/ruoyi-ai -Djansi.passthrough=true -Dmaven.home=/usr/local/apache-maven-3.9.11 -Dclassworlds.conf=/usr/local/apache-maven-3.9.11/bin/m2.conf -Dmaven.ext.class.path=/Applications/IntelliJ IDEA CE.app/Contents/plugins/maven/lib/maven-event-listener.jar -javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=57664 -Dfile.encoding=UTF-8 -classpath /usr/local/apache-maven-3.9.11/boot/plexus-classworlds.license:/usr/local/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar org.codehaus.classworlds.Launcher -Didea.version=2025.1.3 -s /usr/local/apache-maven-3.9.11/conf/settings.xml -Dmaven.repo.local=/usr/local/apache-maven-3.9.11/maven-repository install [INFO] Scanning for projects... Downloading from aliyunmaven: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-starter-parent/3.4.4/spring-boot-starter-parent-3.4.4.pom [WARNING] Failed to create tracking file parent '/usr/local/apache-maven-3.9.11/maven-repository/org/springframework/boot/spring-boot-starter-parent/3.4.4/spring-boot-starter-parent-3.4.4.pom.lastUpdated' java.nio.file.AccessDeniedException: /usr/local/apache-maven-3.9.11/maven-repository/org at sun.nio.fs.UnixException.translateToIOException (UnixException.java:90) at sun.nio.fs.UnixException.rethrowAsIOException (UnixException.java:106) at sun.nio.fs.UnixException.rethrowAsIOException (UnixException.java:111) at sun.nio.fs.UnixFileSystemProvider.createDirectory (UnixFileSystemProvider.java:397) at java.nio.file.Files.createDirectory (Files.java:700) at java.nio.file.Files.createAndCheckIsDirectory (Files.java:807) at java.nio.file.Files.createDirectories (Files.java:793) at 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(DefaultProjectBuilder.java:546) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:410) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:367) at org.apache.maven.graph.DefaultGraphBuilder.collectProjects (DefaultGraphBuilder.java:351) at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor (DefaultGraphBuilder.java:342) at org.apache.maven.graph.DefaultGraphBuilder.build (DefaultGraphBuilder.java:76) at org.apache.maven.DefaultMaven.buildGraph (DefaultMaven.java:448) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:197) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173) at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101) at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906) at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283) at org.apache.maven.cli.MavenCli.main (MavenCli.java:206) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:569) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255) at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361) at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314) at org.codehaus.classworlds.Launcher.main (Launcher.java:41) [ERROR] Internal error: java.io.UncheckedIOException: java.nio.file.AccessDeniedException: /usr/local/apache-maven-3.9.11/maven-repository/org -> [Help 1] org.apache.maven.InternalErrorException: Internal error: java.io.UncheckedIOException: java.nio.file.AccessDeniedException: /usr/local/apache-maven-3.9.11/maven-repository/org at 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org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:410) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:546) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:410) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:367) at org.apache.maven.graph.DefaultGraphBuilder.collectProjects (DefaultGraphBuilder.java:351) at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor (DefaultGraphBuilder.java:342) at org.apache.maven.graph.DefaultGraphBuilder.build (DefaultGraphBuilder.java:76) at org.apache.maven.DefaultMaven.buildGraph (DefaultMaven.java:448) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:197) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173) at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101) at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906) at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283) at org.apache.maven.cli.MavenCli.main (MavenCli.java:206) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:569) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255) at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361) at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314) at org.codehaus.classworlds.Launcher.main (Launcher.java:41) Caused by: java.nio.file.AccessDeniedException: /usr/local/apache-maven-3.9.11/maven-repository/org at sun.nio.fs.UnixException.translateToIOException (UnixException.java:90) at sun.nio.fs.UnixException.rethrowAsIOException (UnixException.java:106) at sun.nio.fs.UnixException.rethrowAsIOException (UnixException.java:111) at sun.nio.fs.UnixFileSystemProvider.createDirectory (UnixFileSystemProvider.java:397) at java.nio.file.Files.createDirectory (Files.java:700) at java.nio.file.Files.createAndCheckIsDirectory (Files.java:807) at java.nio.file.Files.createDirectories (Files.java:793) at org.eclipse.aether.internal.impl.DefaultTrackingFileManager.update (DefaultTrackingFileManager.java:77) at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.write (DefaultUpdateCheckManager.java:529) at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.touchArtifact (DefaultUpdateCheckManager.java:476) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.evaluateDownloads (DefaultArtifactResolver.java:636) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads (DefaultArtifactResolver.java:545) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve (DefaultArtifactResolver.java:449) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts (DefaultArtifactResolver.java:261) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact (DefaultArtifactResolver.java:243) at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact (DefaultRepositorySystem.java:278) at org.apache.maven.project.ProjectModelResolver.resolveModel (ProjectModelResolver.java:172) at org.apache.maven.project.ProjectModelResolver.resolveModel (ProjectModelResolver.java:218) at org.apache.maven.model.building.DefaultModelBuilder.readParentExternally (DefaultModelBuilder.java:1033) at org.apache.maven.model.building.DefaultModelBuilder.readParent (DefaultModelBuilder.java:825) at org.apache.maven.model.building.DefaultModelBuilder.build (DefaultModelBuilder.java:336) at org.apache.maven.model.building.DefaultModelBuilder.build (DefaultModelBuilder.java:248) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:447) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:410) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:546) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:410) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:546) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:410) at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:367) at org.apache.maven.graph.DefaultGraphBuilder.collectProjects (DefaultGraphBuilder.java:351) at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor (DefaultGraphBuilder.java:342) at org.apache.maven.graph.DefaultGraphBuilder.build (DefaultGraphBuilder.java:76) at org.apache.maven.DefaultMaven.buildGraph (DefaultMaven.java:448) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:197) at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173) at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101) at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906) at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283) at org.apache.maven.cli.MavenCli.main (MavenCli.java:206) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method) at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77) at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke (Method.java:569) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255) at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361) at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314) at org.codehaus.classworlds.Launcher.main (Launcher.java:41) [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/InternalErrorException 进程已结束,退出代码为 1

org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is java.lang.IllegalStateException: EntityManagerFactory is closed at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:431) at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373) at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130) at org.flowable.common.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:56) at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30) at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56) at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:51) at org.flowable.common.engine.impl.query.AbstractQuery.list(AbstractQuery.java:117) at org.flowable.eventregistry.impl.management.DefaultEventRegistryChangeDetectionManager.detectChanges(DefaultEventRegistryChangeDetectionManager.java:50) at org.flowable.eventregistry.impl.management.EventRegistryChangeDetectionRunnable.run(EventRegistryChangeDetectionRunnable.java:35) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset$$$capture(FutureTask.java:308) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)

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