Sting type을 UTF-8로 전환하기

public static String getConvertUTF_8(String str)
{
String sUTF_8 = "";
byte[] bytes = null;

try
{
bytes = str.getBytes("UTF-8");
sUTF_8 = new String(bytes);
}
catch(Exception ex)
{
}
return sUTF_8;
}