Java Program to change the case of entered String according to user choice

import java.io.*;
import java.util.*;
public class CaseChanger{
    Scanner scan=new Scanner(System.in);
    String string, caseType;
    public void input(){
        try{
            System.out.println("Enter any String to convert it: ");
            string=scan.nextLine();
            System.out.println("Enter \"Upper\" for upper case or \"Lower\" for lower case: ");
            caseType=scan.next();
        }
        catch(Exception e){
            System.out.println("Error Code: "+e);
            System.exit(0);
        }
    }

    public void compute(){
        if(caseType.equalsIgnoreCase("Upper"))
            upperCase();
        else if(caseType.equalsIgnoreCase("Lower"))
            lowerCase();
        else
            System.out.println("Wrong Case Type i.e. \""+caseType+"\".");
    }

    public void upperCase(){
        System.out.println("String in Upper Case: "+(string.toUpperCase()));
    }

    public void lowerCase(){
        System.out.println("String in Lower Case: "+(string.toLowerCase()));
    }

    public static void main(String[] args){
        CaseChanger obj=new CaseChanger();
        obj.input();
        obj.compute();
    }
}