コンテキストとはどういう意味ですか?

InitialContext ic=new InitialContext();RMIAdaptor server=(RMIAdaptor)ic.lookup("jmx/invoker/RMIAdaptor");

// 获取应用程序包的AssetManager实例
public abstract AssetManager getAssets();
// 获取应用程序包的Resources实例
public abstract Resources getResources();
// 获取PackageManager实例，以查看全局package信息
public abstract PackageManager getPackageManager();
// 获取应用程序包的ContentResolver实例
public abstract ContentResolver getContentResolver();
// 它返回当前进程的主线程的Looper，此线程分发调用给应用组件(activities, services等)
public abstract Looper getMainLooper();
// 返回当前进程的单实例全局Application对象的Context
public abstract Context getApplicationContext();
// 从string表中获取本地化的、格式化的字符序列
public final CharSequence getText(int resId) {
return getResources().getText(resId);
}
// 从string表中获取本地化的字符串
public final String getString(int resId) {
return getResources().getString(resId);
}
public final String getString(int resId, Object... formatArgs) {
return getResources().getString(resId, formatArgs);
}
// 返回一个可用于获取包中类信息的class loader
public abstract ClassLoader getClassLoader();
// 返回应用程序包名
public abstract String getPackageName();
// 返回应用程序信息
public abstract ApplicationInfo getApplicationInfo();
// 根据文件名获取SharedPreferences
public abstract SharedPreferences getSharedPreferences(String name,
int mode);
// 其根目录为: Environment.getExternalStorageDirectory()
public abstract File getExternalFilesDir(String type);
// 返回应用程序obb文件路径
public abstract File getObbDir();
// 启动一个新的activity
public abstract void startActivity(Intent intent);
// 启动一个新的activity
public void startActivityAsUser(Intent intent, UserHandle user) {
throw new RuntimeException("Not implemented. Must override in a subclass.");
}
// 启动一个新的activity
// intent: 将被启动的activity的描述信息
// options: 描述activity将如何被启动
public abstract void startActivity(Intent intent, Bundle options);
// 启动多个新的activity
public abstract void startActivities(Intent[] intents);
// 启动多个新的activity
public abstract void startActivities(Intent[] intents, Bundle options);
// 广播一个intent给所有感兴趣的接收者，异步机制
public abstract void sendBroadcast(Intent intent);
// 广播一个intent给所有感兴趣的接收者，异步机制
public abstract void sendBroadcast(Intent intent,String receiverPermission);
//发送有序广播
public abstract void sendOrderedBroadcast(Intent intent,String receiverPermission);
public abstract void sendOrderedBroadcast(Intent intent,
String receiverPermission, BroadcastReceiver resultReceiver,
Handler scheduler, int initialCode, String initialData,
Bundle initialExtras);
public abstract void sendBroadcastAsUser(Intent intent, UserHandle user);
public abstract void sendBroadcastAsUser(Intent intent, UserHandle user,
String receiverPermission);
// 注册一个BroadcastReceiver，且它将在主activity线程中运行
public abstract Intent registerReceiver(BroadcastReceiver receiver,
IntentFilter filter);
//取消注册BroadcastReceiver
public abstract Intent registerReceiver(BroadcastReceiver receiver,
IntentFilter filter, String broadcastPermission, Handler scheduler);
public abstract void unregisterReceiver(BroadcastReceiver receiver);
// 请求启动一个application service
public abstract ComponentName startService(Intent service);
// 请求停止一个application service
public abstract boolean stopService(Intent service);
// 连接一个应用服务，它定义了application和service间的依赖关系
public abstract boolean bindService(Intent service, ServiceConnection conn,
int flags);
// 断开一个应用服务，当服务重新开始时，将不再接收到调用，
// 且服务允许随时停止
public abstract void unbindService(ServiceConnection conn);
// 返回系统级service
public abstract Object getSystemService(String name);
//检查权限
public abstract int checkPermission(String permission, int pid, int uid);
// 返回一个新的与application name对应的Context对象
public abstract Context createPackageContext(String packageName,
int flags) throws PackageManager.NameNotFoundException;
// 返回基于当前Context对象的新对象，其资源与display相匹配
public abstract Context createDisplayContext(Display display);