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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
 
public class DemoObjectStream {
 
	static String pathName = "C:/Users/ta/Desktop/javaProgram/abc";
public static void writeFile(String path) {
		ObjectOutputStream out = null;
try {
			out = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(path)));
			NhanVien nv00 = new NhanVien("A", 18, 4.0);
			NhanVien nv01 = new NhanVien("B", 19, 6.0);
			NhanVien nv02 = new NhanVien("C", 20, 5.0);
			NhanVien nv03 = new NhanVien("D", 21, 7.0);
			out.writeObject(nv00);
			out.writeObject(nv01);
			out.writeObject(nv02);
			out.writeObject(nv03);
			System.out.println("Kết thúc chương trình !");
 
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		} finally {
			try {
				out.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
 
	public static void readFile(String path) {
		ObjectInputStream input = null;
		try {
			input = new ObjectInputStream(new BufferedInputStream(new FileInputStream(path)));
			NhanVien nv = (NhanVien) input.readObject();
			System.out.println("Tên nhân viên 1 :" + nv.getName());
 
			nv = (NhanVien) input.readObject();
			System.out.println("Tên nhân viên 2 :" + nv.getName());
 
			nv = (NhanVien) input.readObject();
			System.out.println("Tên nhân viên 3 :" + nv.getName());
 
			nv = (NhanVien) input.readObject();
			System.out.println("Tên nhân viên 4 :" + nv.getName());
 
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		} finally {
			try {
				input.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
 
	public static void main(String[] args) {
 
		writeFile(pathName);
		readFile(pathName);
 
	}
 
}
 

Main.java:9: error: class DemoObjectStream is public, should be declared in a file named DemoObjectStream.java
public class DemoObjectStream {
       ^
Main.java:16: error: cannot find symbol
			NhanVien nv00 = new NhanVien("A", 18, 4.0);
			^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:16: error: cannot find symbol
			NhanVien nv00 = new NhanVien("A", 18, 4.0);
			                    ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:17: error: cannot find symbol
			NhanVien nv01 = new NhanVien("B", 19, 6.0);
			^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:17: error: cannot find symbol
			NhanVien nv01 = new NhanVien("B", 19, 6.0);
			                    ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:18: error: cannot find symbol
			NhanVien nv02 = new NhanVien("C", 20, 5.0);
			^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:18: error: cannot find symbol
			NhanVien nv02 = new NhanVien("C", 20, 5.0);
			                    ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:19: error: cannot find symbol
			NhanVien nv03 = new NhanVien("D", 21, 7.0);
			^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:19: error: cannot find symbol
			NhanVien nv03 = new NhanVien("D", 21, 7.0);
			                    ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:43: error: cannot find symbol
			NhanVien nv = (NhanVien) input.readObject();
			^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:43: error: cannot find symbol
			NhanVien nv = (NhanVien) input.readObject();
			               ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:46: error: cannot find symbol
			nv = (NhanVien) input.readObject();
			      ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:49: error: cannot find symbol
			nv = (NhanVien) input.readObject();
			      ^
  symbol:   class NhanVien
  location: class DemoObjectStream
Main.java:52: error: cannot find symbol
			nv = (NhanVien) input.readObject();
			      ^
  symbol:   class NhanVien
  location: class DemoObjectStream
14 errors

Standard output is empty