how to add a java package to my java library?

I have 1.6.0_22 version of Java installed on Mac OS 开发者_JAVA技巧X. I was trying to write a file operation program and wanted to use java.nio.file package's 'Path' class but I can't find that package? How can I add it to my project?

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Path is only available in Java 1.7:

From the JavaDocs:

Since: 1.7