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# UntagCertificateAuthority
<a name="JavaApi-UnTagPCA"></a>

以下 Java 示例显示了如何使用该[UntagCertificateAuthority](https://docs.aws.amazon.com/privateca/latest/APIReference/API_UntagCertificateAuthority.html)操作。

此操作可从私有 CA 中删除一个或多个标签。一个标签由一个键值对组成。如果您在调用此操作时未指定标签的值部分，则会删除标签，而不管值如何。如果您指定了值，则仅删除与指定值关联的标签。要向私有 CA 添加标签，请使用[TagCertificateAuthority](https://docs.aws.amazon.com/privateca/latest/APIReference/API_TagCertificateAuthority.html)操作。调用[ListTags](https://docs.aws.amazon.com/privateca/latest/APIReference/API_ListTags.html)操作以查看哪些标签与您的 CA 关联。

```
package com.amazonaws.samples;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.client.builder.AwsClientBuilder.EndpointConfiguration;
import com.amazonaws.auth.AWSStaticCredentialsProvider;

import java.util.ArrayList;

import com.amazonaws.services.acmpca.AWSACMPCA;
import com.amazonaws.services.acmpca.AWSACMPCAClientBuilder;

import com.amazonaws.services.acmpca.model.UntagCertificateAuthorityRequest;
import com.amazonaws.services.acmpca.model.Tag;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.acmpca.model.ResourceNotFoundException;
import com.amazonaws.services.acmpca.model.InvalidArnException;
import com.amazonaws.services.acmpca.model.InvalidTagException;

public class UntagCertificateAuthority {

   public static void main(String[] args) throws Exception {

      // Retrieve your credentials from the C:\Users\name\.aws\credentials file
      // in Windows or the .aws/credentials file in Linux.
      AWSCredentials credentials = null;
      try {
          credentials = new ProfileCredentialsProvider("default").getCredentials();
      } catch (Exception e) {
          throw new AmazonClientException("Cannot load your credentials from disk", e);
      }

      // Define the endpoint for your sample.
      String endpointRegion = "{{region}}";  // Substitute your region here, e.g. "us-west-2"
      String endpointProtocol = "https://acm-pca." + endpointRegion + ".amazonaws.com/";
      EndpointConfiguration endpoint =
          new AwsClientBuilder.EndpointConfiguration(endpointProtocol, endpointRegion);

      // Create a client that you can use to make requests.
      AWSACMPCA client = AWSACMPCAClientBuilder.standard()
          .withEndpointConfiguration(endpoint)
          .withCredentials(new AWSStaticCredentialsProvider(credentials))
          .build();

      // Create a Tag object with the tag to delete.
      Tag tag = new Tag();
      tag.withKey("{{Administrator}}");
      tag.withValue("{{Bob}}");

      // Add the tags to a collection.
      ArrayList<Tag> tags = new ArrayList<Tag>();
      tags.add(tag);

      // Create a request object and specify the certificate authority ARN.
      UntagCertificateAuthorityRequest req = new UntagCertificateAuthorityRequest();
      req.withCertificateAuthorityArn("arn:{{aws}}:acm-pca:{{us-east-1}}:{{111122223333}}:certificate-authority/{{11223344-1234-1122-2233-112233445566}}");
      req.withTags(tags);

      // Delete the tag
      try {
          client.untagCertificateAuthority(req);
      } catch (InvalidArnException ex) {
          throw ex;
      } catch (ResourceNotFoundException ex) {
          throw ex;
      } catch (InvalidTagException ex) {
          throw ex;
      }
   }
}
```