code: @Override
      public void setStrength(int newStrength) {
          checkNotFrozen();
          if(newStrength == getStrength()) { return; }
          CollationSettings ownedSettings = getOwnedSettings();
          ownedSettings.setStrength(newStrength);
          setFastLatinOptions(ownedSettings);
      }
docs: Sets this Collator's strength attribute. The strength attribute determines the minimum level of difference
  considered significant during comparison.
  
  <p>See the Collator class description for an example of use.
  
  @param newStrength
  the new strength value.
  @see #getStrength
  @see #setStrengthDefault
  @see #PRIMARY
  @see #SECONDARY
  @see #TERTIARY
  @see #QUATERNARY
  @see #IDENTICAL
  @exception IllegalArgumentException
  If the new strength value is not one of PRIMARY, SECONDARY, TERTIARY, QUATERNARY or IDENTICAL.