import java.sql.Date;
public class TypeChange {
  public TypeChange() {
  }
  //change the string type to the int type
  public static  int stringToInt(String intstr)
  {
    Integer integer;
    integer = Integer.valueOf(intstr);
    return integer.intValue();
  }
  //change int type to the string type
  public static String intToString(int value)
  {
    Integer integer = new Integer(value);
    return integer.toString();
  }
  //change the string type to the float type
  public static  float stringToFloat(String floatstr)
  {
    Float floatee;
    floatee = Float.valueOf(floatstr);
    return floatee.floatValue();
  }
  //change the float type to the string type
  public static String floatToString(float value)
  {
    Float floatee = new Float(value);
    return floatee.toString();
  }
  //change the string type to the sqlDate type
  public static java.sql.Date stringToDate(String dateStr)
  {
    return  java.sql.Date.valueOf(dateStr);
  }
  //change the sqlDate type to the string type
  public static String dateToString(java.sql.Date datee)
  {
    return datee.toString();
  }
 
  public static void main(String[] args)
  {
    java.sql.Date day ;
    day = TypeChange.stringToDate("2003-11-3");
    String strday = TypeChange.dateToString(day);
    System.out.println(strday);
  }
 

}

import java.sql.Date;
public class TypeChange {
  public TypeChange() {
  }
  //change the char type to int type
  public int charToInt(char c){
    return Character.getNumericValue(c);
  }
  
  //change the string type to the int type
  public static  int stringToInt(String intstr)
  {
    Integer integer;
    integer = Integer.valueOf(intstr);
    return integer.intValue();
  }
  //change int type to the string type
  public static String intToString(int value)
  {
    Integer integer = new Integer(value);
    return integer.toString();
  }
  //change the string type to the float type
  public static  float stringToFloat(String floatstr)
  {
    Float floatee;
    floatee = Float.valueOf(floatstr);
    return floatee.floatValue();
  }
  //change the float type to the string type
  public static String floatToString(float value)
  {
    Float floatee = new Float(value);
    return floatee.toString();
  }
  //change the string type to the sqlDate type
  public static java.sql.Date stringToDate(String dateStr)
  {
    return  java.sql.Date.valueOf(dateStr);
  }
  //change the sqlDate type to the string type
  public static String dateToString(java.sql.Date datee)
  {
    return datee.toString();
  }
 
  public static void main(String[] args)
  {
    java.sql.Date day ;
    day = TypeChange.stringToDate("2003-11-3");
    String strday = TypeChange.dateToString(day);
    System.out.println(strday);
  }
 

}

Update TypeChange.java