<分区>
我正在学习教程，对“this”关键字的使用产生了疑问。在类的构造函数中，this.mContext 是不是多余地使用了 referred 关键字？仅仅使用 mContext 会不会一样？
//package org.harrix.sqliteexample;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.content.Context;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.File;
public class DatabaseHelper extends SQLiteOpenHelper {
private static String DB_NAME = "info.db";
private static String DB_PATH = "";
private static final int DB_VERSION = 1;
private SQLiteDatabase mDataBase;
private final Context mContext;
private boolean mNeedUpdate = false;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
if (android.os.Build.VERSION.SDK_INT >= 17)
DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
else
DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
this.mContext = context;
copyDataBase();
this.getReadableDatabase();
}