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ÕªÒª£º BigDecimal decimal = new BigDecimal("3.116"); //ËÄÉáÎåÈë(>=5½øλ) BigDecimal decimal1 = decimal.setScale(2, BigDecimal.ROUND_HALF_UP); //ËÄÉáÎåÈë(>5½øλ) BigDecim ÔĶÁÈ«ÎÄ

ÕªÒª£º List<Integer> list = new ArrayList<>(); list.add(1); list.add(2); list.add(3); //ÊÇ·ñÖÁÉÙÒ»¸öÔªËØÂú×ã boolean match = list.stream().anyMatch(i -> i > 2 && i < 6 ÔĶÁÈ«ÎÄ

ÕªÒª£º List<String> list = new ArrayList<>(); List<BigDecimal> newList = list.stream().map(BigDecimal::new).collect(Collectors.toList()); ÔĶÁÈ«ÎÄ

ÕªÒª£º //Êý×éÈ¥ÖØ //ÓÅ»¯±éÀúÊý×é·¨ function uniqueArr(array) { var r = []; for (var i = 0, l = array.length; i < l; i++) { for (var j = i + 1; j < l; j++) if (array[i]. ÔĶÁÈ«ÎÄ

ÕªÒª£º Map<String, List<OperationNodeVo>> listMap = nodeVoList.stream().collect(Collectors.groupingBy(OperationNodeVo::getNodeCode)); ÔĶÁÈ«ÎÄ

ÕªÒª£º List<Map<String, Object>> list = new ArrayList<>(); Map<String, Object> map1 = new HashMap<>(); map1.put("name", "Æ»¹û"); map1.put("code", "apple"); lis ÔĶÁÈ«ÎÄ

ÕªÒª£º -- extractÖ»ÄÜ´ÓdateÀàÐÍÖÐÌáÈ¡Äê¡¢Ô¡¢ÈÕ -- Äê select extract(year from sysdate) from dual; -- Ô select extract(month from sysdate) from dual; -- ÈÕ select extract(d ÔĶÁÈ«ÎÄ

ÕªÒª£º -- mysqlÉú³Éuuid select uuid(); -- Ìæ»»- select replace(uuid(),'-',''); ÔĶÁÈ«ÎÄ

ÕªÒª£º -- sql serverÉú³Éuuid select newid(); -- Ìæ»»- select replace(newid(),'-',''); ÔĶÁÈ«ÎÄ

ÕªÒª£º -- oracleÉú³Éuuid select sys_guid() from dual; -- ½â¾öÂÒÂë select rawtohex(sys_guid()) from dual; ÔĶÁÈ«ÎÄ