Question

我收到了一份客户名单。每个客户都有一个账户清单，每个账户都有一个交易清单。

最近，我一直使用ObjectOutputStream / ObjectInputStream为我的程序实现导入/导出功能。这样可以正常保存所有内容和负载。

我的问题是，一旦更改了ArrayList，JTable就不会自动更新（我创建了一个自定义JTableModel，它目前只将每个单元格设置为不可编辑。是否有任何符合我需要的侦听器？我的CustomJTableModel扩展的DefaultTableModel。

我获得了在包含JMenuBar的自定义MainMenu类中加载/保存的触发器，并且它不直接了解TableModel或JTable（否则我可以以“便宜”的方式进行再次添加）。 / p>

有一些方法，例如fireTableDataChanged，但只能监听JTable本身。

不确定我是否需要发布任何代码，认为这可能是一个简单的问题，并且那里有一个适合的监听器。

Answer 1

我对你的问题的建议是在你的JTable类中实现（Java观察者接口）并在你的类中实现（Java可观察接口）利用和修改ArrayList。这样，每次对arrayList进行更改时，都会调用update方法，因此会更新JTable。

这是一个教程，详细介绍了我的上述解释

public class JTable implements Observer
{

// this is the method that will be invoked everytime a change has occured.
 public void update(Observable obs, Object obj)
   {
      // To implements as required
   }

}

public class Store implements Observable
{
   ArrayList<Customers> listOfCustomers;

 public void setValue(Customer n)
   {
      this.listOfCustomers.Add(n);
      setChanged();
      notifyObservers(); // this will notify your JTable
   }
}

这只是如何实施该系统的开始。

Answer 2

我的问题是，一旦ArrayList被更改，JTable就不会自动更新

那么你不应该对ArrayList进行更改。

ArrayList应该用作TableModel的数据结构。然后，如果要对ArrayList进行更改（即添加/删除行），则应通过TableModel完成此操作。

有关使用此方法创建自定义模型的分步示例，请参阅Row Table Model。

现在，另一方面，如果你的问题是存储在ArrayList中的Object的属性发生了变化，那么是的，你需要使用2018-05-02T15:50:54,024 ERROR [main] SpringApplication id= marker= - Application startup failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataSourceInitializerPostProcessor': Unsatisfied dependency expressed through field 'beanFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobRepository': Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:592) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:370) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:223) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:702) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:527) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE] at com.vanguard.fig.risk.webservice.Application.main(Application.java:75) [classes/:?] Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobRepository': Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities) at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:240) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1148) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getSingletonFactoryBeanForTypeCheck(AbstractAutowireCapableBeanFactory.java:881) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:808) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:544) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:425) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:390) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.BeanFactoryUtils.beanNamesForTypeIncludingAncestors(BeanFactoryUtils.java:220) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1243) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1094) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1059) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:589) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE] ... 17 more模式。

使自定义JTableModel侦听ArrayList中的更改

2 个答案: