Tanggal and Jam

ActionListener taskPerformer=new ActionListener(){
public void actionPerformed(ActionEvent evt){
String nol_bulan="";
String nol_hari="";
String nol_jam="";
String nol_menit="";
String nol_detik="";
Calendar dt=Calendar.getInstance();
int nilai_tahun=dt.get(dt.YEAR);
int nilai_bulan=dt.get(dt.MONTH)+1;
int nilai_hari=dt.get(dt.DAY_OF_MONTH);
int nilai_jam=dt.get(dt.HOUR_OF_DAY);
int nilai_menit=dt.get(dt.MINUTE);
int nilai_detik=dt.get(dt.SECOND);
if(nilai_bulan<=9){
nol_bulan="0";
}
if(nilai_hari<=9){
nol_hari="0";
}
if(nilai_jam<=9){
nol_jam="0";
}
if(nilai_menit<=9){
nol_menit="0";
}
if(nilai_detik<=9){
nol_detik="0";
}
String bulan=nol_bulan+Integer.toString(nilai_bulan);
String hari=nol_hari+Integer.toString(nilai_hari);
String jam=nol_jam+Integer.toString(nilai_jam);
String menit=nol_menit+Integer.toString(nilai_menit);
String detik=nol_detik+Integer.toString(nilai_detik);
jLabel1.setText(hari+"-"+bulan+"-"+nilai_tahun);
jMenu13.setText(jam+":"+menit+":"+detik);
}
};
new javax.swing.Timer(1000,taskPerformer).start();