//snippet-sourcedescription:[UpdateUser.java demonstrates how to update the name of an IAM user.]
//snippet-keyword:[SDK for Java 2.0]
//snippet-keyword:[Code Sample]
//snippet-service:[iam]
//snippet-sourcetype:[full-example]
//snippet-sourcedate:[03/02/2020]
//snippet-sourceauthor:[scmacdon-aws]
/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.example.iam;
// snippet-start:[iam.java2.update_user.complete]
// snippet-start:[iam.java2.update_user.import]
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.iam.IamClient;
import software.amazon.awssdk.services.iam.model.IamException;
import software.amazon.awssdk.services.iam.model.UpdateUserRequest;
import software.amazon.awssdk.services.iam.model.UpdateUserResponse;
// snippet-end:[iam.java2.update_user.import]

/**
 * Updates an IAM user's username
 */
public class UpdateUser {
    public static void main(String[] args) {

        final String USAGE =
                "To run this example, supply the current username and a new\n" +
                        "username. Ex:\n\n" +
                        "UpdateUser <current-name> <new-name>\n";

        if (args.length != 1) {
            System.out.println(USAGE);
            System.exit(1);
        }

        String curName = args[0];
        String newName = args[1];

        // snippet-start:[iam.java2.update_user.main]
        Region region = Region.AWS_GLOBAL;
        IamClient iam = IamClient.builder()
                .region(region)
                .build();

        try {
            UpdateUserRequest request = UpdateUserRequest.builder()
                .userName(curName)
                .newUserName(newName).build();

            UpdateUserResponse response = iam.updateUser(request);
            // snippet-end:[iam.java2.update_user.main]

            System.out.printf("Successfully updated user to username %s",
                newName);
        } catch (IamException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        System.out.println("Done");
        }
}
// snippet-end:[iam.java2.update_user.complete]

@@ -182,19 +182,23 @@
 ervice:%5B
-iam
+AWS IAM
 %5D%0D%0A//sni
@@ -922,59 +922,10 @@
 m;%0D%0A
-// snippet-start:%5Biam.java2.update_user.complete%5D
 %0D%0A
+
 // s
@@ -1699,12 +1699,11 @@
 gth 
-!= 1
+%3C 2
 ) %7B%0D
@@ -1861,63 +1861,8 @@
 %0D%0A%0D%0A
-        // snippet-start:%5Biam.java2.update_user.main%5D%0D%0A
     
@@ -2000,32 +2000,229 @@
    .build();%0D%0A%0D%0A
+        updateIAMUser(iam, curName, newName) ;%0D%0A    %7D%0D%0A%0D%0A    // snippet-start:%5Biam.java2.update_user.main%5D%0D%0A    public static void updateIAMUser(IamClient iam, String curName,String newName ) %7B%0D%0A%0D%0A
         try %7B%0D%0A 
@@ -2447,67 +2447,8 @@
 );%0D%0A
-            // snippet-end:%5Biam.java2.update_user.main%5D%0D%0A%0D%0A
     
@@ -2738,19 +2738,20 @@
      %7D%0D%0A
-%7D%0D%0A
+    
 // snipp
@@ -2784,15 +2784,14 @@
 ser.
-complete%5D
+main%5D%0D%0A%7D
 %0D%0A

Update UpdateUser.java