java _io_文件字符流输出

String s="ada"; char[] a=s.toCharArray(); 将字符串转换成字符数组

public class test{
	public static void main(String[]args)
	{
		File f =new File("D:d/write.txt");
		Writer writer=null;
		try {
			writer=new FileWriter(f);
		
		//写法一
		/*String s="adad  afaff哈哈哈";
		char[] ch=s.toCharArray(); //从字符串到字符数组
		writer.write(ch,0,ch.length);
		**write.flush();***/
		//写法二
		/*String s="adad  afaff哈哈哈2";
		writer.write(s,0,s.length()); //因为字符串就是字符数组，所以可以直接使用
		writer.write("addd");   //可实现多次写入
		writer.write("fff");
		**writer.flush();**
		*/
		
		//写法三
		/*writer.append("adad").append("aaa\n"); 
		**writer.flush();***/
		
			
	}catch(FileNotFoundException e)
	{
		e.printStackTrace();
	}catch(IOException e)
	{
		e.printStackTrace();
	}finally {
		try {
			if(null!=writer)
			{
				**writer.close();**
			}
		}catch(IOException e)
		{
			e.printStackTrace();
		}
	}
}

}