code: public DescribeKeyPairsRequest withKeyNames(String... keyNames) {
          if (this.keyNames == null) {
              setKeyNames(new com.amazonaws.internal.SdkInternalList<String>(keyNames.length));
          }
          for (String ele : keyNames) {
              this.keyNames.add(ele);
          }
          return this;
      }
docs: <p>
  The key pair names.
  </p>
  <p>
  Default: Describes all your key pairs.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setKeyNames(java.util.Collection)} or {@link #withKeyNames(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param keyNames
  The key pair names.</p>
  <p>
  Default: Describes all your key pairs.
  @return Returns a reference to this object so that method calls can be chained together.