java数据类型转换

// 集合转字符串
List<String> list = new ArrayList<>();
list.add("1");
list.add("2");
list.add("3");
String column = Joiner.on(",").join(ColumnIds);

// 字符串转集合
String column = "1,2,3";
List<String> list = Arrays.asList(column .split(","))

// 字符串转数组
String column = "1,2,3";
String[] ids = column.split(",")