Android : ANDROID. why FAIL, PUBLIC_STATIC_STRING_IDENTIFIER, STATIC_INTEGER_VALUE, etc

I'm new and I have this problem

    public void onActivityResult(int requestCode, int resultCode, Intent data) {     
  super.onActivityResult(requestCode, resultCode, data); 
  switch(requestCode) { 
    case (STATIC_INTEGER_VALUE) : {                                         
      if (resultCode == Activity.RESULT_OK) { 
      int tabIndex = data.getIntExtra(PUBLIC_STATIC_STRING_IDENTIFIER);
      // TODO Switch tabs using the index.
      } 
      break; 
    } 
  } 
}     

PUBLIC_STATIC_STRING_IDENTIFIER and STATIC_INTEGER_VALUE say me

"PUBLIC_STATIC_STRING_IDENTIFIER cannot be resolved to a variable" and "STATIC_INTEGER_VALUE cannot be resolved to a variable"

I need to import java... shomething?