SQLite database is not creating

SQLite database in android is not creating i have used method getwritabledatabase(); in main class... but the only log appears "Constructor is called" and then application is closed. Here i have code for table extends SQLiteOpenHelper class

enter code here

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;

import java.sql.SQLDataException;
import java.sql.SQLException;

public class Table extends SQLiteOpenHelper {

private static final String DATABASE_NAME = "Hammas's Database";
private static final String TABLE_NAME = "Hammas's Table";
private static final int DATABASE_VERSION = 1;
private static final String ID = "_id";
private static final String COLNAME = "Names";
private static final String CREATE_TABLE = "CREATE TABLE "+TABLE_NAME+" ("+ID+" INTEGER PRIMARY KEY AUTOINCREMENT,"+COLNAME+" VARCHAR(255));";
private static final String DROP_TABLE = "DROP TABLE IF EXIST "+TABLE_NAME+"";
private static final String TAG = "Hammas";
private Context context;
public Table(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
    this.context = context;
    Message.message(context,"Constructor is called");
    Log.i(TAG,"CONSTRUCTOR IS CALLED");
}

@Override
public void onCreate(SQLiteDatabase db)  {

      db.execSQL(CREATE_TABLE);
      Message.message(context, "onCreate is called");


}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL(DROP_TABLE);
    onCreate(db);
    Message.message(context,"onUpgrade is called");
}

} Message class is just for toast. Here is mainClass

enter code here

public class MainActivity extends ActionBarActivity {
Table table;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list_view);

    table = new Table(this);
    SQLiteDatabase sql=  table.getReadableDatabase();


}