Collections are used to store, retrieve, manipulate, and communicate aggregate data.
Answer:
False
Explanation:
An abstract class is a class declared abstract — it may or may not include abstract techniques. It is not possible to instantiate abstract classes, but they can be sub-classed.
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<u>Abstract method declaration</u>
abstract void moveTo(double X, double Y);
Usually the subclass offers solutions for all of the abstract techniques in its parent class when an abstract class is sub-classed. If not, however, the subclass must be declared abstract as well.
<u>Example</u>
public abstract class GraphicObject {
// declaring fields
// declaring non-abstract methods
abstract void draw();
}
Answer:
Answered below
Explanation:
//Program is written in Java.
public void first three elements(int[] nums){
int I;
//Check if array has up to three elements
if(nums.length > 3){
for(I = 0; I < nums.length; I++){
while (I < 3){
System.out.println(nums [I]);
}
}
else{
System.out.print("Array does not contain up to three elements");
}
}
}