这个问题在这里已经有了答案:关闭10年前。PossibleDuplicate:HowdoIiterateovereachEntryinaMap?我有一张map,Mapmap=newHashMap();publicclassRecords{StringcountryName;longnumberOfDays;publicStringgetCountryName(){returncountryName;}publicvoidsetCountryName(StringcountryName){this.countryName=countryName;}publiclonggetNumberO