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<TITLE>Listing the Main Attributes in a JAR File Manifest (Java Developers Almanac Example)
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    <B><A HREF="../java.util.jar/pkg.html">java.util.jar</A></B><font color="#666666" class="xsmall-font">
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  <h3>e381. Listing the Main Attributes in a JAR File Manifest</h3>

The main attributes of a JAR file are values that are associated with
the JAR file itself, not with any particular entry.


<pre>    try {
        // Open the JAR file
        JarFile jarfile = new JarFile(<font color="#0066ff"><i>"filename.jar"</i></font>);
    
        // Get the manifest
        Manifest manifest = jarfile.getManifest();
    
        // Get the main attributes in the manifest
        Attributes attrs = (Attributes)manifest.getMainAttributes();
    
        // Enumerate each attribute
        for (Iterator it=attrs.keySet().iterator(); it.hasNext(); ) {
            // Get attribute name
            Attributes.Name attrName = (Attributes.Name)it.next();
    
            // Get attribute value
            String attrValue = attrs.getValue(attrName);
        }
    } catch (IOException e) {
    }
</pre>
Here's an example of main attributes for a JAR file:

<pre>    Attribute Name: Attribute Value
    
    Specification-Title: Java Platform API Specification
    Specification-Version: 1.4
    Implementation-Title: Java Runtime Environment
    Implementation-Version: 1.4.0-rc
    Created-By: 1.4.0 (Sun Microsystems Inc.)
    Manifest-Version: 1.0
    Implementation-Vendor: Sun Microsystems, Inc.
    Specification-Vendor: Sun Microsystems, Inc.
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e380. <a class="eglink" href="GetManifest.html?l=rel">
    Listing the Entries of a JAR File Manifest
</a>
<br>

e382. <a class="eglink" href="CreateManifest.html?l=rel">
    Creating a Manifest for a JAR File
</a>
<br>

e383. <a class="eglink" href="WriteFile.html?l=rel">
    Writing a JAR File Manifest to a File
</a>
<br>

e384. <a class="eglink" href="CreateJar.html?l=rel">
    Creating and Signing a JAR File Using jarsigner
</a>
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