Static member 'java.lang.Thread.sleep(long)' accessed via instance reference 。这是什么原因

这个错误是因为你在使用静态方法时使用了实例化对象来调用它。应该使用类名来调用静态方法，而不是对象实例。

例如，对于Thread类中的静态方法sleep()，应该使用以下方式来调用：

Thread.sleep(1000); // 使用类名调用静态方法

而不是：

Thread thread = new Thread();
thread.sleep(1000); // 错误的调用方式，使用实例化对象调用静态方法

因此，如果你想在代码中使用Thread.sleep()来暂停执行，就需要使用类名Thread来调用静态方法，而不是创建一个Thread对象来调用它。

相关问题

Static member 'java.lang.String.join(java.lang.CharSequence, java.lang.CharSequence...)' accessed via instance reference

The error message "Static member 'java.lang.String.join(java.lang.CharSequence, java.lang.CharSequence...)' accessed via instance reference" occurs when you try to call the static method `join` on an instance of the `String` class instead of calling it on the class itself.

The `join` method is used to join a group of strings together with a delimiter. It takes two parameters: a delimiter and an array of strings. Here is an example of how to use it:

String[] words = {"hello", "world", "how", "are", "you"};
String joinedWords = String.join(" ", words);
System.out.println(joinedWords);

In this example, we create an array of strings called `words`, and then use the `join` method of the `String` class to join the strings together with a space delimiter.

If you see the error message "Static member 'java.lang.String.join(java.lang.CharSequence, java.lang.CharSequence...)' accessed via instance reference", it means that you are calling the `join` method on an instance of the `String` class, rather than on the class itself. To fix the error, make sure you call the method on the class, like this:

String[] words = {"hello", "world", "how", "are", "you"};
String joinedWords = String.join(" ", words);
System.out.println(joinedWords);

Note that in the corrected code, we are calling the `join` method on the `String` class itself, not on an instance of the `String` class.

Static member 'com.measdatamgmt. ExportHdxlDataService. exportHdxlData' accessed via instance reference

在Java中，"Static member 'com.measdatamgmt.ExportHdxlDataService.exportHdxlData' accessed via instance reference" 这种情况通常是指在一个实例上调用了静态方法（Static method），而静态方法通常是属于类而不是对象的。静态方法可以直接通过类名而非对象实例来访问。

`ExportHdxlDataService.exportHdxlData`看起来像是一个名为 `exportHdxlData` 的静态方法，它位于 `ExportHdxlDataService` 类中。如果在一个具体的 `ExportHdxlDataService` 实例上调用了这个方法，尽管它是静态的，但仍然通过实例引用来间接调用。

例如：

// 创建了一个 ExportHdxlDataService 的实例
ExportHdxlDataService service = new ExportHdxlDataService();

// 虽然exportHdxlData是一个静态方法，但我们通过服务对象来调用它
service.exportHdxlData(); // 尽管static，但通过实例引用调用

然而，直接使用类名 `ExportHdxlDataService.exportHdxlData()` 是完全可行的，不通过实例也能访问：

ExportHdxlDataService.exportHdxlData(); // 直接通过类名调用静态方法