The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进,并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要,请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息,请参阅JDK发行说明。
In this lesson, you will act as the receiver of the signed jar file containing the count.class
file. It requests access to your system resources on your system that it normally would not have permission to access.
This procedure requires you to perform the following steps listed below.
keytool -import
command, and give it the alias susan
.count
application signed by susan
to read the specified file on your system.count
application to verify that with a trusted certificate and access to your new policy file that grants it permission to read files on your system, count
can now read your data
file.