code: public void setKeyUsage(java.util.Collection<String> keyUsage) {
          if (keyUsage == null) {
              this.keyUsage = null;
              return;
          }
  
          this.keyUsage = new java.util.ArrayList<String>(keyUsage);
      }
docs: <p>
  Specify one or more <a>KeyUsage</a> extension values.
  </p>
  
  @param keyUsage
  Specify one or more <a>KeyUsage</a> extension values.
  @see KeyUsageName