IO流写出到本地 D盘demoIO.txt 文本中

1.

public class Hello {
    private static final  String LINE_SEPARATOR = System.getProperty("line.separator");//换行
    public static void main(String[] args) throws Exception {
        FileWriter writer = null;
        try{
            writer = new FileWriter("d:\demoIO.txt");
            writer.write("abcdedd"+LINE_SEPARATOR+"HELLOWORLD");
        }catch (Exception e){
            System.out.println(e.toString());
        }finally {
            if (writer != null){
                try{
                    writer.close();
                }catch (Exception e){
                    throw new RuntimeException("关闭失败");
                }
            }
        }
    }