String user = JOptionPane.showInputDialog(null,"Enter Username: ");

    String pass = JOptionPane.showInputDialog(null,"Enter Password: ");

    if(user.equals("jas")&&(pass.equals("bsit"))){
        JOptionPane.showMessageDialog(null,"Welcome "+ user);
    Selection Class = new Selection();
    Selection.Selection1();
    }

    else if (!user.equals("jas")||(!pass.equals("bsit"))) {

    JOptionPane.showMessageDialog(null,
    "Invalid Username or Password",
    "Wrong Authentication",
    JOptionPane.ERROR_MESSAGE);
    System.exit(0);


    }

class Selection{
       public Selection1(){

    try{
    String select = JOptionPane.showInputDialog("[1]Homen[2]Profilen[3]Logout");
    int numbers = Integer.parseInt(select);

    if (numbers == 1){
    JOptionPane.showMessageDialog(null,"Mang Tani: Lumakas ang hanging amihan halos nilipad ang mga bubong ng mga bahaynnJessica Soho: Isang sikat na pagkain sa davao inubos ng kabataan nn Boying Remulla: Walang pasok dahil sa malakas na ulann#WalangPasok.");
return select;
    }
    else if (numbers == 2){
        JOptionPane.showMessageDialog(null,"Name: Ralph Jasper nn Age: 17 nn Address: Tierra Nevada, General Trias, Cavite");

    }
    else if (numbers == 3){

    }

    }
    catch (NumberFormatException nfe){
        JOptionPane.showMessageDialog(null,"Please input only numbers","Invalid Input",JOptionPane.ERROR_MESSAGE);
    }
}
 }