老师我没弄懂他这个红黑树和节点的转化?红黑树是怎么形成的?
中间那个m循环还是有点不理解,还有就是
result.append(c+m*100)
放在列表里?有点抽象
老师,它这里只给了这两个值,在页面里是怎么做到那种树结构的效果的,而且为什么EasyUITree的变量值必须类id,text和state啊?
老师,模糊查询的key不是brand吗?为什么是name?
tkinter * tkinter messagebox Application(Frame): (,master=): ().(master) .master = master .pack() .createWidget() createWidget(): .label01=Label(,=) .label01.pack() v1=StringVar() .entry01 = Entry(,=) .entry01.pack() v1.set() (v1.get());(.entry01.get()) .label02 = Label(,=) .label02.pack() v2=StringVar() .entry02 = Entry(,=v2,=) .entry02.pack() Button(=,=.login).pack() login(self): username = self.entry01.get() pwd = self.entry02.get() () (+username) pringt(+pwd) username=pwd=messagebox.showinfo() : messagebox.showinfo() __name__==; root = Tk() root.geometry() app = Application(=root) root.mainloop()
老师。不知道这是什么意思,代码在这里!
老师有什么推荐的刷题网站吗
老师,有个问题想问一下,就是今年ChatGPT来势汹汹,我在网上了解到这是一个人类自然语言AI,而且具有很强的迭代能力,想问一下,未来程序员不是不变成了面向GPT编程?现在有很多说程序员将要被GPT衍生的自动写代码软件干掉,有没有这种可能呢?程序员在面对AI智能的时候,还能有发展空间吗?或者说,我还有必要努力去学习编程语言吗?
可以添加但不能查询所有数据
"C:\Program Files\Java\jdk1.8.0_221\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\idea\IntelliJ IDEA 2020.1\lib\idea_rt.jar=63153:D:\idea\IntelliJ IDEA 2020.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_221\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar;E:\JavaDemo\Springboot\springbootdemo\jdbc\target\classes;E:\repository\org\springframework\boot\spring-boot-starter-web\2.5.2\spring-boot-starter-web-2.5.2.jar;E:\repository\org\springframework\boot\spring-boot-starter\2.5.2\spring-boot-starter-2.5.2.jar;E:\repository\org\springframework\boot\spring-boot\2.5.2\spring-boot-2.5.2.jar;E:\repository\org\springframework\boot\spring-boot-autoconfigure\2.5.2\spring-boot-autoconfigure-2.5.2.jar;E:\repository\org\springframework\boot\spring-boot-starter-logging\2.5.2\spring-boot-starter-logging-2.5.2.jar;E:\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;E:\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;E:\repository\org\apache\logging\log4j\log4j-to-slf4j\2.14.1\log4j-to-slf4j-2.14.1.jar;E:\repository\org\apache\logging\log4j\log4j-api\2.14.1\log4j-api-2.14.1.jar;E:\repository\org\slf4j\jul-to-slf4j\1.7.31\jul-to-slf4j-1.7.31.jar;E:\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;E:\repository\org\yaml\snakeyaml\1.28\snakeyaml-1.28.jar;E:\repository\org\springframework\boot\spring-boot-starter-json\2.5.2\spring-boot-starter-json-2.5.2.jar;E:\repository\com\fasterxml\jackson\core\jackson-databind\2.12.3\jackson-databind-2.12.3.jar;E:\repository\com\fasterxml\jackson\core\jackson-annotations\2.12.3\jackson-annotations-2.12.3.jar;E:\repository\com\fasterxml\jackson\core\jackson-core\2.12.3\jackson-core-2.12.3.jar;E:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.12.3\jackson-datatype-jdk8-2.12.3.jar;E:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.12.3\jackson-datatype-jsr310-2.12.3.jar;E:\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.12.3\jackson-module-parameter-names-2.12.3.jar;E:\repository\org\springframework\boot\spring-boot-starter-tomcat\2.5.2\spring-boot-starter-tomcat-2.5.2.jar;E:\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.48\tomcat-embed-core-9.0.48.jar;E:\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.48\tomcat-embed-el-9.0.48.jar;E:\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.48\tomcat-embed-websocket-9.0.48.jar;E:\repository\org\springframework\spring-web\5.3.8\spring-web-5.3.8.jar;E:\repository\org\springframework\spring-beans\5.3.8\spring-beans-5.3.8.jar;E:\repository\org\springframework\spring-webmvc\5.3.8\spring-webmvc-5.3.8.jar;E:\repository\org\springframework\spring-aop\5.3.8\spring-aop-5.3.8.jar;E:\repository\org\springframework\spring-context\5.3.8\spring-context-5.3.8.jar;E:\repository\org\springframework\spring-expression\5.3.8\spring-expression-5.3.8.jar;E:\repository\org\springframework\boot\spring-boot-starter-thymeleaf\2.5.2\spring-boot-starter-thymeleaf-2.5.2.jar;E:\repository\org\thymeleaf\thymeleaf-spring5\3.0.12.RELEASE\thymeleaf-spring5-3.0.12.RELEASE.jar;E:\repository\org\thymeleaf\thymeleaf\3.0.12.RELEASE\thymeleaf-3.0.12.RELEASE.jar;E:\repository\org\attoparser\attoparser\2.0.5.RELEASE\attoparser-2.0.5.RELEASE.jar;E:\repository\org\unbescape\unbescape\1.1.6.RELEASE\unbescape-1.1.6.RELEASE.jar;E:\repository\org\slf4j\slf4j-api\1.7.31\slf4j-api-1.7.31.jar;E:\repository\org\thymeleaf\extras\thymeleaf-extras-java8time\3.0.4.RELEASE\thymeleaf-extras-java8time-3.0.4.RELEASE.jar;E:\repository\org\springframework\boot\spring-boot-starter-jdbc\2.5.2\spring-boot-starter-jdbc-2.5.2.jar;E:\repository\com\zaxxer\HikariCP\4.0.3\HikariCP-4.0.3.jar;E:\repository\org\springframework\spring-jdbc\5.3.8\spring-jdbc-5.3.8.jar;E:\repository\org\springframework\spring-tx\5.3.8\spring-tx-5.3.8.jar;E:\repository\mysql\mysql-connector-java\5.1.38\mysql-connector-java-5.1.38.jar;E:\repository\com\alibaba\druid\1.1.12\druid-1.1.12.jar;E:\repository\org\springframework\spring-core\5.3.8\spring-core-5.3.8.jar;E:\repository\org\springframework\spring-jcl\5.3.8\spring-jcl-5.3.8.jar" com.cx.jdbc.JdbcApplication . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.5.2) 2021-07-21 11:31:07.469 INFO 1844 --- [ main] com.cx.jdbc.JdbcApplication : Starting JdbcApplication using Java 1.8.0_221 on LAPTOP-ND40CVRV with PID 1844 (E:\JavaDemo\Springboot\springbootdemo\jdbc\target\classes started by 86138 in E:\JavaDemo\Springboot\springbootdemo) 2021-07-21 11:31:07.472 INFO 1844 --- [ main] com.cx.jdbc.JdbcApplication : No active profile set, falling back to default profiles: default 2021-07-21 11:31:08.555 INFO 1844 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2021-07-21 11:31:08.563 INFO 1844 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2021-07-21 11:31:08.563 INFO 1844 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.48] 2021-07-21 11:31:08.646 INFO 1844 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2021-07-21 11:31:08.646 INFO 1844 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1131 ms 2021-07-21 11:31:09.041 INFO 1844 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2021-07-21 11:31:09.051 INFO 1844 --- [ main] com.cx.jdbc.JdbcApplication : Started JdbcApplication in 2.19 seconds (JVM running for 3.368) 2021-07-21 11:31:36.935 INFO 1844 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet' 2021-07-21 11:31:36.935 INFO 1844 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet' 2021-07-21 11:31:36.936 INFO 1844 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 0 ms 2021-07-21 11:31:37.050 ERROR 1844 --- [nio-8080-exec-1] org.thymeleaf.TemplateEngine : [THYMELEAF][http-nio-8080-exec-1] Exception processing template "findUserAll": Error resolving template [findUserAll], template might not exist or might not be accessible by any of the configured Template Resolvers org.thymeleaf.exceptions.TemplateInputException: Error resolving template [findUserAll], template might not exist or might not be accessible by any of the configured Template Resolvers at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) [thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) [thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) [thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) [thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1396) [spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1141) [spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1080) [spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) [spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.3.8.jar:5.3.8] at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) [tomcat-embed-core-9.0.48.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.3.8.jar:5.3.8] at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) [tomcat-embed-core-9.0.48.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.3.8.jar:5.3.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.8.jar:5.3.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.3.8.jar:5.3.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.8.jar:5.3.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.3.8.jar:5.3.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.8.jar:5.3.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.48.jar:9.0.48] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_221] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_221] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.48.jar:9.0.48] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_221] 2021-07-21 11:31:37.056 ERROR 1844 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: Error resolving template [findUserAll], template might not exist or might not be accessible by any of the configured Template Resolvers] with root cause org.thymeleaf.exceptions.TemplateInputException: Error resolving template [findUserAll], template might not exist or might not be accessible by any of the configured Template Resolvers at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) ~[thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE] at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1396) ~[spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1141) ~[spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1080) ~[spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.8.jar:5.3.8] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.8.jar:5.3.8] at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.48.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.8.jar:5.3.8] at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.48.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.8.jar:5.3.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.8.jar:5.3.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.8.jar:5.3.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.8.jar:5.3.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.8.jar:5.3.8] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.8.jar:5.3.8] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723) [tomcat-embed-core-9.0.48.jar:9.0.48] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.48.jar:9.0.48] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_221] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_221] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.48.jar:9.0.48] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_221]
代码
package com.bjsxt; /** * 口红类 */ class Lipstick{ } /** * 镜子类 */ class Mirror{ } /** * 化妆线程类 */ class Makeup extends Thread{ private int flag; //flag=0:拿着口红。flag!=0:拿着镜子 private String girlName; static Lipstick lipstick = new Lipstick(); static Mirror mirror = new Mirror(); public void setFlag(int flag) { this.flag = flag; } public void setGirlName(String girlName) { this.girlName = girlName; } @Override public void run() { this.doMakeup(); } /** * 开始化妆 */ public void doMakeup(){ if(flag == 0){ synchronized (lipstick){ System.out.println(this.girlName+" 拿着口红"); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } synchronized (mirror){ System.out.println(this.girlName+" 拿着镜子"); } }else{ synchronized (mirror){ System.out.println(this.girlName+" 拿着镜子"); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } } synchronized (lipstick){ System.out.println(this.girlName+" 拿着口红"); } } } } public class DeadLockThread { public static void main(String[] args) { Makeup makeup = new Makeup(); makeup.setFlag(0); makeup.setGirlName("大丫"); Makeup makeup1 = new Makeup(); makeup1.setFlag(1); makeup1.setGirlName("小丫"); makeup.start(); makeup1.start(); } }
两个线程都是同时执行,口红类被锁了当它要去用镜子时已经被else里的先占用了,还是死锁的状态啊?为什么可以执行呢?
老师,这是MySQL中的3张表vend_1,vend_2,vend_3,现在我想查询3张表中vend_id出现次数超过2次的vend_id有哪些,要求查询结果返回vend_id及出现的次数
SQL语句要怎么写呢?
老师,不是说实例化不能用new吗?
还有获取计算机的IP地址不应该直接是isa.getHostAddress();吗?这个getAddress()是什么意思?
我登陆的网站参数有点多,如何解决,需要解决这个验证码,然后excution是什么?
老师为什么我这个Tread是红色的
我没有给 “jacymin”这个用户分配unlimited tablespace 这个权限,也可以创建table呢?
这么多语言,由浅入深应该是什么呢?
先学习和了解的,然后进阶的顺序是什么?
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