재가 왕초보라서 코딩이 재대로 한것지도 모르겠습니다

고수님들에 조언을 들고자 합니다

소스는

protected static final String TAG = null;
protected static final boolean D = false;
/** Called when the activity is first created. */
 Spinner s;

 
    /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);}
 
      private void car_sub_type(int itemNum){

       ArrayAdapter<CharSequence> fAdapter;

       fAdapter = ArrayAdapter.createFromResource(this, itemNum, android.R.layout.simple_spinner_item);

       fAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

       s.setAdapter(fAdapter);

      }

private OnItemSelectedListener choice_type = new OnItemSelectedListener(){
   
 public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    switch(position){
       case (0):
         if(D)Log.d((String) TAG,"ListCheck_01");
         Intent intent_01 = new Intent(SpinnerChoice.this,tjdoddmatlr.class); ==>new Intent(SpinnerChoice.this,tjdoddmatlr.class);=에러가생김
          startActivity(intent_01);
          break;
       case (1):
           if(D)Log.d((String) TAG,"ListCheck_02");
           Intent intent_02 = new Intent(SpinnerChoice.this,didtlr.class); ==>new Intent(SpinnerChoice.this,didtlr.class);=에러가 생김
        startActivity(intent_02);
        break;
       case (2):
           if(D)Log.d((String) TAG,"ListCheck_03");
           Intent intent_03 = new Intent(SpinnerChoice.this,dlftlr.class); ==> new Intent(SpinnerChoice.this,dlftlr.class);=에러가 생김
        startActivity(intent_03);
        break;
       case (3):
           if(D)Log.d((String) TAG,"ListCheck_04");
           Intent intent_04 = new Intent(SpinnerChoice.this,dlftlr.class);==> new Intent(SpinnerChoice.this,dlftlr.class);=에러가생김
        startActivity(intent_04);
        break;
    }}
    public void onNothingSelected(AdapterView<?> parent) {
}};}

이렇습니다  에러나는 부분과 코딩에 관해서 틀린점 지적부탁드립니다.......~~~~