String格式转换 --去符号

快来打我* 2023-06-24 11:28 32阅读 0赞

public static void main(String[] args) { 
            String head = CSVUtil.joinByLineSeparator(Arrays.asList(CSVUtil.joinByCommas(new String[]{ 
                    "1", "2", "3", "4"
            })));
    
            System.out.println("head = " + head);
            List<String> strings = Arrays.asList(CSVUtil.joinByCommas(new String[]{ "1", "2", "3", "4"}));
            String string = strings.toString();
            System.out.println("string = " + string);
            System.out.println("STRINGS="+strings);
        }

![在这里插入图片描述][2019122309350262.png]

// 转换工具类
        static class CSVUtil { 
    
            static String joinByCommas(String[] cols) { 
                List<String> colList = Arrays.asList(cols);
                return joinByCommas(colList);
            }
    
            static String joinByCommas(List<String> colList) { 
    
                return join(colList, ",");
            }
    
            static String joinByLineSeparator(String[] lines) { 
                List<String> lineList = Arrays.asList(lines);
                return joinByLineSeparator(lineList);
            }
    
            static String joinByLineSeparator(List<String> lineList) { 
                return join(lineList, System.getProperty("line.separator"));
            }
    
            static String join(List<String> strList, String separator) { 
                if (CollectionUtils.isEmpty(strList)) { 
                    return "";
                } else if (strList.size() > 1) { 
                    String first = StringUtils.isNotEmpty(strList.get(0)) ? strList.get(0) : "";
                    return first.concat(separator).concat(join(strList.subList(1, strList.size()), separator));
                } else { 
                    return strList.get(0);
                }
            }
    
        }

[2019122309350262.png]: https://img-blog.csdnimg.cn/2019122309350262.png