访问限制:“Application”类型不是API(对所需库rt.jar的限制)
这是代码:
package mscontroller;import javax.swing.*;
import com.apple.eawt.Application;
public class Main {
public static void main(String[] args)
{
Application app = new Application();
app.setEnabledAboutMenu(true);
AMEListener listener = new AMEListener();
app.addApplicationListener(listener);
JFrame mainFrame = new JFrame("Application Menu Example");
mainFrame.setSize(500, 500);
mainFrame.setVisible(true);
}
}
这是错误:
Exception in thread "main" java.lang.Error: Unresolved compilationproblems: Access restriction: The type 'Application' is not API
(restriction on required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
Access restriction: The constructor 'Application()' is not API
(restriction on required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
Access restriction: The type 'Application' is not API (restriction on
required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
Access restriction: The method
'Application.setEnabledAboutMenu(boolean)' is not API (restriction on
required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
AMEListener cannot be resolved to a type AMEListener cannot be
resolved to a type
at mscontroller.Main.main(Main.java:9)
eclipse says this:
访问限制:类型“应用程序”不是API(对所需库“ /Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar”的限制)
回答:
这也发生在我身上,这里给出的答案已经不令人满意,所以我做了自己的研究。
背景:Eclipse 访问限制
Eclipse具有一种称为访问限制的机制,可防止你意外使用Eclipse认为不属于公共API的类。通常,从两种意义上讲,Eclipse都是正确的:我们通常不想使用不属于公共API的内容。Eclipse通常对公共API的组成部分是正确的是正确的。
问题
现在,在某些情况下,你想使用公共Non-API,例如sun.misc
(你不应该,除非你知道自己在做什么)。在某些情况下,Eclipse
并不是真的正确(这就是发生在我身上的事情,我只是想使用javax.smartcardio
)。在这种情况下,我们会在Eclipse
中收到此错误。
解
解决方案是更改访问限制。
- Go to the properties of your Java project,
- i.e. by selecting “Properties” from the context menu of the project in the “Package Explorer”.
- Go to “Java Build Path”, tab “Libraries”.
- Expand the library entry
- select
- “Access rules”,
- “Edit…” and
- “Add…” a “Resolution: Accessible” with a corresponding rule pattern. For me that was “javax/smartcardio/”.
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