from ruby to java

i need this function from ruby to java: key={ "21"=>0, "20"=>15, "19"=>11, "18"=>9, "17"=>2, "16"=>11, "15"=>4, "14"=>1, "13"=>17, "12"=>2, "11"=>21, "10"=>12, "9"=>1, "8"=>13, "7"=>15, "6"=>5, "5"=>14, "4"=>13, "3"=>9, "2"=>15, "1"=>17, "0"=>7 } token = "wkerTXIIad3lPCgAwBV8ef" result = [login to view URL] [login to view URL] do |from, to| from = from.to_i result[from], result[to] = result[to], result[from] end puts result