Simply saying, Java context means Java native methods all together.
In next Java code two lines of code needs context: // (1) and // (2)
import java.io.*;
public class Runner{
public static void main(String[] args) throws IOException { // (1)
File file = new File("D:/text.txt");
String text = "";
BufferedReader reader = new BufferedReader(new FileReader(file));
String line;
while ((line = reader.readLine()) != null){ // (2)
text += line;
}
System.out.println(text);
}
}
(1) needs context because is invoked by Java native method private native void java.lang.Thread.start0();
(2) reader.readLine() needs context because invokes Java native method public static native void java.lang.System.arraycopy(Object src, int srcPos, Object dest, int destPos, int length);
PS.
That is what BalusC is sayed about pattern Facade more strictly.