public void addInterface(String interfaceName){
  short interfaceIndex=itsConstantPool.addClass(interfaceName);
  itsInterfaces.add(Short.valueOf(interfaceIndex));
}

public void addInterface ( String interfaceName ) { short interfaceIndex = itsConstantPool . addClass ( interfaceName ) ; itsInterfaces . add ( Short . valueOf ( interfaceIndex ) ) ; }
add an interface implemented by this class . this method may be called multiple times for classes that implement multiple interfaces .
