java.io.File的getAbsolutePath是做什么的
时间: 2024-06-02 17:08:01 浏览: 90
Java中的java.io.File类的getAbsolutePath()方法返回文件的绝对路径名字符串。绝对路径名是完整的路径名,包括文件的根目录和所有父目录。此方法返回的字符串表示文件的完整路径名,如果该文件是相对路径,则此方法将返回相对于Java虚拟机的当前工作目录的路径。如果无法获取文件的绝对路径,则此方法将返回空字符串。
相关问题
maven报错 Cannot invoke "java.io.File.getAbsolutePath()" because "file" is null
这个错误通常表示在代码中尝试调用一个空的文件对象的 `getAbsolutePath()` 方法。造成这个错误的原因可能是未正确初始化文件对象或者文件对象不存在。
你可以检查以下几个方面来解决这个问题:
1. 确保你正确初始化了文件对象。检查代码中是否调用了构造函数创建了文件对象,并且传入了正确的文件路径参数。
2. 确保文件存在。在调用 `getAbsolutePath()` 方法之前,确保文件对象对应的文件确实存在。你可以使用 `file.exists()` 方法来检查文件是否存在。
如果你能提供更多的代码和错误堆栈信息,我可以给出更具体的建议。
An internal error occurred during: "Launching 组合". Cannot invoke "java.io.File.getAbsolutePath()" because the return value of "org.eclipse.jdt.internal.launching.LaunchingPlugin.getFileInPlugin(org.eclipse.core.runtime.IPath)" is null
This error message is related to Eclipse and launching a program within the IDE. It indicates that there is an issue with the configuration or setup of the program launch. The error message specifically states that the method "getAbsolutePath()" cannot be invoked because the return value of "getFileInPlugin()" is null, meaning that the file path being referenced cannot be found.
To resolve this error, you can try the following steps:
1. Restart Eclipse and try launching the program again.
2. Check that the program launch configuration is set up correctly, including the file path and other settings.
3. Make sure that all necessary files and resources are included in the project and that they are accessible.
4. If the error persists, try creating a new program launch configuration and see if that resolves the issue.
5. If none of these steps work, try reinstalling Eclipse or resetting the workspace to its default settings.
If you are still unable to resolve the error, you may need to seek further assistance from the Eclipse community or support team.