e020. creating a file.txt

这里面包含了一百多个JAVA源文件

try {
        File file = new File("filename");
    
        // Create file if it does not exist
        boolean success = file.createNewFile();
        if (success) {
            // File did not exist and was created
        } else {
            // File already exists
        }
    } catch (IOException e) {
    }