code: public ListVaultsResult withVaultList(DescribeVaultOutput... vaultList) {
          if (this.vaultList == null) {
              setVaultList(new java.util.ArrayList<DescribeVaultOutput>(vaultList.length));
          }
          for (DescribeVaultOutput ele : vaultList) {
              this.vaultList.add(ele);
          }
          return this;
      }
docs: <p>
  List of vaults.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setVaultList(java.util.Collection)} or {@link #withVaultList(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param vaultList
  List of vaults.
  @return Returns a reference to this object so that method calls can be chained together.