code: public ListBackupVaultsResult withBackupVaultList(BackupVaultListMember... backupVaultList) {
          if (this.backupVaultList == null) {
              setBackupVaultList(new java.util.ArrayList<BackupVaultListMember>(backupVaultList.length));
          }
          for (BackupVaultListMember ele : backupVaultList) {
              this.backupVaultList.add(ele);
          }
          return this;
      }
docs: <p>
  An array of backup vault list members containing vault metadata, including Amazon Resource Name (ARN), display
  name, creation date, number of saved recovery points, and encryption information if the resources saved in the
  backup vault are encrypted.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setBackupVaultList(java.util.Collection)} or {@link #withBackupVaultList(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param backupVaultList
  An array of backup vault list members containing vault metadata, including Amazon Resource Name (ARN),
  display name, creation date, number of saved recovery points, and encryption information if the resources
  saved in the backup vault are encrypted.
  @return Returns a reference to this object so that method calls can be chained together.