Need some help

[Cross4321]

i tried to make a program Number to Word ranging -9999 to 9999

idk how do i even make it work

import java.io.*;

public class Num2Word {

    public static void main (String[] args) {

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

        String o="Y";
        String x;

        do { String ans="",ones="",tens="",hundreds="",thousands="";

        try {
            System.out.println("Enter a Number Between -9999 to 9999:");
            x=dataln.readLine();
            int num=Integer.parseInt(x);
            int ones=num%10;
            int tens=(num/10)%10;
            int hundreds=(num/100)%10;
            int thousands=num/1000;
            if(num>=1&&num<=9999){

        //Units Method
            switch(ones){
                   case 1:
                   System.out.print("One");
                   break;
                   case 2:
                   System.out.print("Two");
                   break;
                   case 3:
                   System.out.print("Three");
                   break;
                   case 4:
                   System.out.print("Four");
                   break;
                   case 5:
                   System.out.print("Five");
                   break;
                   case 6:
                   System.out.print("Six");
                   break;
                   case 7:
                   System.out.print("Seven");
                   break;
                   case 8:
                   System.out.print("Eight");
                   break;
                   case 9:
                   System.out.print("Nine");
                   break;
                }
        //Special Method
            switch(ones){
                   case 11:
                   System.out.print("Eleven");
                   break;
                   case 12:
                   System.out.print("Twelve");
                   break;
                   case 13:
                   System.out.print("Thirteen");
                   break;
                   case 14:
                   System.out.print("Fourteen");
                   break;
                   case 15:
                   System.out.print("Fifteen");
                   break;
                   case 16:
                   System.out.print("Sixteen");
                   break;
                   case 17:
                   System.out.print("Seventeen");
                   break;
                   case 18:
                   System.out.print("Eighteen");
                   break;
                   case 19:
                   System.out.print("Nineteen");
                   break;
                }
        //Tens Method
            switch(tens){
                   case 10:
                   System.out.print("Eleven");
                   break;
                   case 20:
                   System.out.print("Twelve");
                   break;
                   case 30:
                   System.out.print("Thirteen");
                   break;
                   case 40:
                   System.out.print("Fourteen");
                   break;
                   case 50:
                   System.out.print("Fifteen");
                   break;
                   case 60:
                   System.out.print("Sixteen");
                   break;
                   case 70:
                   System.out.print("Seventeen");
                   break;
                   case 80:
                   System.out.print("Eighteen");
                   break;
                   case 90:
                   System.out.print("Nineteen");
                   break;
        }
        //Hundreds Method
            switch(hundreds){
                   case 1:
                   System.out.print("OneHundred");
                   break;
                   case 2:
                   System.out.print("TwoHundred");
                   break;
                   case 3:
                   System.out.print("ThreeHundred");
                   break;
                   case 4:
                   System.out.print("FourHundred");
                   break;
                   case 5:
                   System.out.print("FiveHundred");
                   break;
                   case 6:
                   System.out.print("SixHundred");
                   break;
                   case 7:
                   System.out.print("SevenHundred");
                   break;
                   case 8:
                   System.out.print("EightHundred");
                   break;
                   case 9:
                   System.out.print("NineHundred");
                   break;
    }
        //Thousands Method
            switch(thousands){
                   case 1:
                   System.out.print("OneThousand");
                   break;
                   case 2:
                   System.out.print("TwoThousand");
                   break;
                   case 3:
                   System.out.print("ThreeThousand");
                   break;
                   case 4:
                   System.out.print("FourThousand");
                   break;
                   case 5:
                   System.out.print("FiveThousand");
                   break;
                   case 6:
                   System.out.print("SixThousand");
                   break;
                   case 7:
                   System.out.print("SevenThousand");
                   break;
                   case 8:
                   System.out.print("EightThousand");
                   break;
                   case 9:
                   System.out.print("NineThousand");
                   break;
    }
            ans=ones+tens+hundreds+thousands;
            System.out.println("Your Input is"+ans);
            System.out.println("Continue?");
            System.out.print("Press Y if Yes");
            x=dataln.readLine();
            }

            else {
                System.out.println("Invalid Range");
            }

        }

        catch(IOException e){
            System.out.println("Error!");
        }
        }
        while (o=="Y");
    }
}

[r035198x]

You can't switch on Strings. Just integral primitives, chars and enums.
You should also compare strings using the equals method.
P.S Smell fried rats when you start to repeat the same (or similar) things over again in code.

[Cross4321]

example pls ;3