Java文件流--向文件输入九九乘法表

代码比较简单，直接贴出了

public class outputStreamClass {
    public static void main(String[] args) throws IOException {
        //createFile();
        createFileAndLineFeed();
    }

  public static void createFileAndLineFeed() throws IOException {
        
        FileOutputStream fos=new FileOutputStream("D:\java idea\A.txt",true);
        for(int i=1;i<=9;i++){
            for(int j=1;j<=i;j++){
            String x=j+"*"+i+"="+i*j+"    ";
            fos.write(x.getBytes(StandardCharsets.UTF_8));
        }
        fos.write("rn".getBytes(StandardCharsets.UTF_8));}
        fos.close();
    }
}