Java

Need help fixing this program:

When I run it, it will have 16 lines on the side. When I press one of the letters in parathesis and press enter it goes back to the opening page but the numbers dissapear.

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import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class Project {

public static void main(String[] args) throws IOException {

System.out.println("\t\t\t\t\t\tJMUBiblio Bibliography Manager");

System.out.println("\t\t\t\t\t\t\t\t CS159 (Fall 2017)");

System.out.println();

System.out.println();

for (int i = 1; i <=16 ; i++) {

System.out.println(i+".");

}

System.out.println();

String operation="";

do {

System.out.println("(A)dd, (E)dit, (D)elete,(S)earch, read(L)ist, (N)ext, (B)ack, (Q)uit");

System.out.println();

operation = getInput();

switch (operation.toLowerCase()) {

case "a":

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "e":

clearScreen();

System.out.println("Edit Book");

System.out.println();

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "d":

clearScreen();

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "s":

clearScreen();

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "l":

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "n":

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "b":

pause("This function is not currently available. Press to continue . . .");

clearScreen();

break;

case "q":

System.exit(0);

break;

default:

System.out.println("Incorrect entry (" + operation + ").Please re-enter.");

break;

}

}while(operation!="q");

}

public static void display(String str)

{

System.out.print(str);

}

public static String getInput() throws IOException {

BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

System.out.print("Choose Operation -> ");

String operation = input.readLine();

return operation;

}

public static void pause(String message) throws IOException {

System.out.println(message);

System.in.read();

}

public static void clearScreen()

{

int lines =25;

int columns = 80;

for(int i=1;i<=lines;i++)

{

for (int j = 0; j

System.out.print(" ");

}

System.out.println("");

}

}

}