Answer:
Following are the code in java language
abstract interface PointingDevice // interface PointingDevice,
{
// abstract method getXCoord()
public abstract int getXCoord();
// abstract method getYCoord()
public abstract int getYCoord();
// abstract method attentionRequired()
public abstract boolean attentionRequired();
// abstract method setResolution( )
public abstract double setResolution(double a);
}
Explanation:
In this code we have declared a abstract interface "PointingDevice" which contains the four abstract method getXCoord of type int , getYCoord() of type int , attentionRequired() of type boolean and setResolution() of type double .
These method have only declaration not definition any interface or class which inherit the inteface PointingDevice must define all these four method otherwise it also be abstract .
B) The gravitational pull of the Sun holds Neptune in its orbit.
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Answer:
To begin designing a relational database, one must define the Logical structure
Explanation:
Primary key: It is a unique key which uniquely identifies each record in a table. So this does not purely defines the relationship of the table during the beginning of the design.
Foreign key: It is a key which is closely connected to the primary key. The value of the column will accept values only if the values exists in the base table.
Physical structure: This is not going to be related to the relationship of the structure since the storage management is done by Operating system.
Only the logical structure clearly defines the relationship in the database. It will have information about the list of tables and fields. It will also mark the relationship between one table and another.
Answer:
True
Explanation:
Using personal computers for internet access has various advantages because of the physical attributes of these computers. One of the major reason that it is good for internet access is its large screen. The large screen allows things to be easily viewed and read. Also, personal computers have a keyboard that helps for easy data entry, as opposed to pads, and other types of devices that may have just touch-pad and data entry may be difficult.
Answer:
If you're talking about perimeter (the length of the outer edges)
Explanation:
