Show DevBest [JAVA] Converter Script

[Hindi]

So what this script does, is asks you for a value in foot and converts to almost anything, CM,MM,Inch etc

import java.util.Scanner;
import javax.swing.JOptionPane;


public class Converter {
   
    Scanner alright = new Scanner(System.in);
   
    public static void cm() {
        String a = JOptionPane.showInputDialog("Enter the Value (FOOT) : ");
       
        int x = Integer.parseInt(a);
        double ans = x * 30.48;
       
        JOptionPane.showMessageDialog(null,"The conversion from foot to cm is : " + ans,"FT TO CM",JOptionPane.PLAIN_MESSAGE);
    }
   
    public static void mm() {
        String a = JOptionPane.showInputDialog("Enter the Value (FOOT) : ");
       
        int x = Integer.parseInt(a);
        double ans = x * 304.8;
       
        JOptionPane.showMessageDialog(null,"The conversion from foot to mm is : " + ans,"FT TO MM",JOptionPane.PLAIN_MESSAGE);
    }
    public static void inch() {
        String a = JOptionPane.showInputDialog("Enter the Value (FOOT) : ");
       
        int x = Integer.parseInt(a);
        double ans = x * 12;
       
        JOptionPane.showMessageDialog(null,"The conversion from foot to Inch is : " + ans,"FT TO Inch",JOptionPane.PLAIN_MESSAGE);
    }
    public static void meter() {
        String a = JOptionPane.showInputDialog("Enter the Value (FOOT) : ");
       
        int x = Integer.parseInt(a);
        double ans = x * 0.3048;
       
        JOptionPane.showMessageDialog(null,"The conversion from foot to Meter is : " + ans,"FT TO Meter",JOptionPane.PLAIN_MESSAGE);
    }
    public static void yard() {
        String a = JOptionPane.showInputDialog("Enter the Value (FOOT) : ");
       
        int x = Integer.parseInt(a);
        double ans = x * 0.333333;
       
        JOptionPane.showMessageDialog(null,"The conversion from foot to Yard is : " + ans,"FT TO Yard",JOptionPane.PLAIN_MESSAGE);
    }
    public static void nauticalmile() {
        String a = JOptionPane.showInputDialog("Enter the Value (FOOT) : ");
       
        int x = Integer.parseInt(a);
        double ans = x * 0.000164579;
       
        JOptionPane.showMessageDialog(null,"The conversion from foot to Nautical Mile is : " + ans,"FT TO Nautical Mile",JOptionPane.PLAIN_MESSAGE);
    }
    public static void main(String args[])
    {
        String choice = JOptionPane.showInputDialog("Select what do you want to convert Foot to (CM,MM,INCH,METER,YARD,NAUTICALMILE");
        switch (choice)
        {
        case "CM":
        case "Centimeter":
        case "CENTIMETER":
            Converter.cm();
            break;
        case "MM":
        case "Milimeter":
        case "MILIMETER":
            Converter.mm();
            break;
        case "Inch":
        case "INCH":
            Converter.inch();
            break;
        case "Meter":
        case "METER":
        case "meter":
            Converter.meter();
            break;
        case "Yard":
        case "YARD":
            Converter.yard();
            break;
        case "NM":
        case "NauticalMile":
        case "NAUTICALMILE":
            Converter.nauticalmile();
            break;
        default:
            JOptionPane.showMessageDialog(null,"Please select appropriate choice", "ERROR",JOptionPane.ERROR_MESSAGE);
           
                   
        }
    }

}

I was lazy to write this ( It was my assignment for Uni ) but @Macemore kept me company aw