rambda
-
JAVA/StreamLanguage/Java 2022. 11. 29. 15:25
Map List 검색 List payCompleteList = new ArrayList(); payCompleteList.add(new HashMap() {{ put("RECEIPT_YM", "202207"); put("aaa", "aa1"); } }); payCompleteList.add(new HashMap() {{ put("RECEIPT_YM", "202210"); put("aaa", "aa2"); } }); Set receiptYearMonthSets = new HashSet(); payCompleteList.forEach(e -> receiptYearMonthSets.add(e.get("RECEIPT_YM"))); System.out.println(receiptYearMonthSets.conta..