public void addBiome(BiomeGenBase biome){
  ArrayList<BiomeGenBase> biomes=new ArrayList<BiomeGenBase>();
  biomes.add(biome);
  allowedBiomes.addAll(getBiomesEntries(biomes));
}

public void addBiome ( BiomeGenBase biome ) { ArrayList < BiomeGenBase > biomes = new ArrayList < BiomeGenBase > ( ) ; biomes . add ( biome ) ; allowedBiomes . addAll ( getBiomesEntries ( biomes ) ) ; }
adds a biome to the list of biomes allowed to spawn on this planet
