Java Programming

I am trying to read a random line in a text file but every time i read it it reads first line of the file any one can help me what is the problem in the code is or provide me with a new code.

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
File file = new File("word.txt");
if(!file.exists())
{
System.out.println("File does not exist.");
System.exit(0);
}
try{
//Open the file for reading
RandomAccessFile raf = new RandomAccessFile(file, "r");

raf.seek(file.length()); //Seek to end of file

System.out.println("Read full line: " + raf.readLine());
//str2 is a String
str2 = str2 + raf.readLine();
System.out.println(""+str2);

raf.close();
System.out.println("Successfully");
}
catch(IOException ioe)
{
System.out.println(ioe.getMessage());
}
my text file look like in this format

mind
hate
Abhor
Bigot
narrow
prejudiced
person
Counterfeit
fake
false
give
voting
rights
Hamper
hinder
obstruct
Kindle
to
start
fire
harmful
poisonous
lethal