[Java] [SonarLint] Remove this hard-coded path-delimiter

Problem
After I run SonarLint check, it complain the following code has problem (Remove this hard-coded path-delimiter):

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try (Writer file = new java.io.FileWriter(new File(testDir.toAbsolutePath() + "\\" + ftlFileName + ".java"));) { Template template = cfg.getTemplate("testcase.ftl"); Map<String, Object> data = new HashMap<>(); data.put("ftlFileName", ftlFileName); template.process(data, file); } catch (IOException | TemplateException e) { throw new FtlFileException("fail to generate file from ftl file : " + e.getMessage(), e); }

How-To
Using File.separator instead of hard code

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try (Writer file = new java.io.FileWriter(new File(testDir.toAbsolutePath() + File.separator + ftlFileName + ".java"));) { Template template = cfg.getTemplate("testcase.ftl"); Map<String, Object> data = new HashMap<>(); data.put("ftlFileName", ftlFileName); template.process(data, file); } catch (IOException | TemplateException e) { throw new FtlFileException("fail to generate file from ftl file : " + e.getMessage(), e); }