[Java] base conversion

其實，這個小小程式設計的源頭都只因為424問了一句 :

Java 做唔做到base互換 (進位換算) ?

如果做唔到，可否base n->base 10 –>base y ?

於是我便動手做了 (>.<) ，如果程式有bug或邏輯問題，歡迎隨時給予意見 !

import java.util.*; public class Main {     public static String number,input;     public static int initialbase,finalbase;     public static void main(String[] args) {         Scanner scanner = new Scanner(System.in);         try{         System.out.println("Enter a value :");         input=scanner.next();         System.out.println("Enter initial base :");         initialbase = scanner.nextInt();         System.out.println("Enter final base :");         finalbase = scanner.nextInt();         }catch(InputMismatchException e){             System.out.println("Invaild value,program exits.");             System.exit(1);         }         converter obj1=new converter();         number=obj1.convert210(input,initialbase,finalbase);         System.out.printf("After conversion : %s ", number);     } } class converter{     String convert210(String x,int base,int finalbase){         try{         long y=Long.parseLong(x, base);         String z = Long.toString(y, finalbase);         return z;         }catch(NumberFormatException e){             System.out.println("Nunber Error occured," +                     "please check your initial base.");             return null;         }     } }