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# Queue Tagging
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Queue tagging enables cost allocation tracking, resource organization, and management through key-value metadata tags applied to SQS queues.
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## Tag Queue
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### Add Tags to Queue
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Apply cost allocation and organizational tags to a queue.
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```java { .api }
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TagQueueResult tagQueue(TagQueueRequest request);
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// Convenience method
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TagQueueResult tagQueue(String queueUrl, Map<String, String> tags);
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class TagQueueRequest extends AmazonWebServiceRequest {
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    String getQueueUrl();
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    TagQueueRequest withQueueUrl(String queueUrl);
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    Map<String, String> getTags();
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    TagQueueRequest withTags(Map<String, String> tags);
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    TagQueueRequest addTagsEntry(String key, String value);
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}
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class TagQueueResult {
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    // Empty result class - success indicated by no exception
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}
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```
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## List Queue Tags
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### Retrieve Queue Tags
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Get all tags currently applied to a queue.
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```java { .api }
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ListQueueTagsResult listQueueTags(ListQueueTagsRequest request);
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// Convenience method
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ListQueueTagsResult listQueueTags(String queueUrl);
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class ListQueueTagsRequest extends AmazonWebServiceRequest {
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    String getQueueUrl();
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    ListQueueTagsRequest withQueueUrl(String queueUrl);
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}
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class ListQueueTagsResult {
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    Map<String, String> getTags();
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}
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```
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## Untag Queue
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### Remove Tags from Queue
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Remove specific tags from a queue by tag key.
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```java { .api }
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UntagQueueResult untagQueue(UntagQueueRequest request);
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// Convenience method  
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UntagQueueResult untagQueue(String queueUrl, List<String> tagKeys);
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class UntagQueueRequest extends AmazonWebServiceRequest {
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    String getQueueUrl();
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    UntagQueueRequest withQueueUrl(String queueUrl);
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    List<String> getTagKeys();
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    UntagQueueRequest withTagKeys(List<String> tagKeys);
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}
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class UntagQueueResult {
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    // Empty result class - success indicated by no exception
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}
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```
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**Usage Example:**
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```java
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// Add tags
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Map<String, String> tags = new HashMap<>();
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tags.put("Environment", "Production");
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tags.put("Team", "Backend");
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tags.put("CostCenter", "Engineering");
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client.tagQueue(new TagQueueRequest()
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    .withQueueUrl(queueUrl)
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    .withTags(tags));
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// List tags
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ListQueueTagsResult result = client.listQueueTags(queueUrl);
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System.out.println("Queue tags: " + result.getTags());
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// Remove specific tags
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client.untagQueue(new UntagQueueRequest()
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    .withQueueUrl(queueUrl)
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    .withTagKeys(Arrays.asList("CostCenter")));
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```