please help me i use java jdk1.7.0_03
C:\Users\moshe\Desktop\TropikMS v90\v90src\client\MapleCustomQuestStatus.java:44: error: cannot find symbol if (!quest.getReqMobs().isEmpty()) { symbol: method isEmpty() location: class ObjectC:\Users\moshe\Desktop\TropikMS v90\v90src\client\MapleCustomQuestStatus.java:56: error: cannot find symbol if (!quest.getReqMobs().isEmpty()) { symbol: method isEmpty() location: class ObjectC:\Users\moshe\Desktop\TropikMS v90\v90src\client\MapleCustomQuestStatus.java:80: error: cannot find symbol for (final int i : quest.getReqMobs().keySet()) { symbol: method keySet() location: class ObjectC:\Users\moshe\Desktop\TropikMS v90\v90src\client\MapleCustomQuestStatus.java:86: error: cannot find symbol for (final Map.Entry<Integer, Integer> qs : quest.getReqMobs().entrySet()) { symbol: method entrySet() location: class ObjectC:\Users\moshe\Desktop\TropikMS v90\v90src\handling\world\CharacterTransfer.java:143: error: cannot find symbol for (Map.Entry<ReportType, Integer> ss : chr.getReports().entrySet()) { symbol: method entrySet() location: class Object