How to Read and Write Data from File in Java

Program 1

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import java.io.*;
class TestWrite
{
    public static void main(String args[]) throws Exception
    {
        //FileOutputStream fos=null;
           FileInputStream fis=null;
        try
        {
                 fis=new FileInputStream("c://dataflairjava/student.txt");
                 char ch;
                 int n;
                 while((n=fis.read())!=-1)
                 {
                    ch=(char)n;
                    System.out.print(ch);
                 }  
            //  fos=new FileOutputStream("c://dataflairjava/student.txt",true);
            //  System.out.println("File created...");
            //      char ch='t';
            //      fos.flush();
            //      fos.write(ch);
        }
        
        finally
        {
            //fos.close();
             fis.close();
        }
    }
}