java將list轉為逗號隔開字串
阿新 • • 發佈:2021-09-13
1.只要不為空,就在後面新增逗號,最後再用subString()函式擷取,去掉最後一位的逗號 List<String> test = new ArrayList<>(); String testStrings = ""; test.add("test1"); test.add("test2"); test.add("test3"); for(String object : test){ if(object != null){ testStrings +=object + ","; } } if(testStrings.length > 0){ testStrings = testStrings.substring(0,testStrings.length() -1); }
2.通過StringUtils的join函式直接獲取逗號隔開字串
List<String> test = new ArrayList<>();
String testStrings = "";
test.add("test1");
test.add("test2");
test.add("test3");
String join = StringUtils.join(test,",");
System.out.println(join);
3.通過流轉換 String newStr = exList.stream().collect(Collectors.joining(",")))
4.將逗號連線的字串轉成字元陣列:
通過String的split函式可以實現
String aaa = "aa,bb,cc";
String[] split = aaa.split(",");
擇善人而交,擇善書而讀,擇善言而聽,擇善行而從。