Java uses DataInputStream to write data to a file, using FileReader to read the demo __java

Java io is really confusing, since there are FileWriter can write the character stream, why create DataOutputStream can also input character flow to the file. The following demo shows that files created by DataOutputStream can be read by FileReader.

Package ZC;
Import java.io.*;

public class Test {public

	void stream () throws ioexception{
		
		String s = "Hello world!";
		DataOutputStream OS = 
				new DataOutputStream (New FileOutputStream ("D:\\abcde.txt"));
		Os.writebytes (s);
		
		FileReader fd = new FileReader ("D:\\abcde.txt");
		
		char[] Ch =new char[1024];
		int lenth;
		
		while ((lenth = Fd.read (ch))!=-1)
		{
			System.out.println (new String (Ch,0,lenth));
		}
	public static void Main (string[] args) throws IOException {
		Test t = new Test ();
		T.stream ();

	}