Formatando tipo data ( mysql) para String

SimpleDateFormat	sdf = new SimpleDateFormat("dd/MM/yyyy");

Date data = sdf.parse(SuaString);

public String converteDataNascimento(String data){
		
		String novaData="";
		
		novaData = data.substring(0,data.indexOf(" ")).replace("-", "/");
		
		
		return novaData;
		
	}

String[] vals = data.split("-");
GregorianCalendar gc = new GregorianCalendar(Integer.parseInt(vals[2]), Integer.parseInt(vals[1]) - 1, 
													 Integer.parseInt(vals[0]));	
Date newData =  gc.getTime();

String[] vals = novaData.split("/"); 
novaString = vals[2]+"/"+vals[1]+"/"+vals[0];

SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); 
    //recebo a data do banco
    Date data  =(list.get(index).getDataCadastro());
    //converte para String
    String date = sdf.format(data);
    JOptionPane.showMessageDialog(null,date);

public String converteData(String data){
   SimpleDateFormat antigo = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   Date data = antigo.parse(data);
   SimpleDateFormat novo = new SimpleDateFormat("dd/MM/yyyy");
   return novo.format(data);
}