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True or False? The length or size of the array is established when the array object is instantiated and cannot be changedthereafter.
True or False? Every array object contains a special property named size that contains the number of elements in an array. It is always possible to determine the number of elements in an array object at runtime byaccessing the value of the size property for the array object.
True or False? There is a special syntax that allows for the instantiation of an array object and the initialization of the array elements in a singlestatement.
True or False? An anonymous class is an object whose reference is not saved in a named reference variable.
True or False? Every class that doesn't explicitly extend another class automatically extends the class named Class .
True or False? The code shown in Listing 3 produces the output shown in Figure 3 where the numeric values are random and vary from one run to the next.
| Listing 3 . Question 13. |
|---|
/*File Java3010rb Copyright 2013, R.G.Baldwin
Rev 02/14/13*********************************************************/
import java.util.*;class Java3010rb{
public static void main(String[]args){
Random generator = new Random(new Date().getTime());int randomNumber = (byte)generator.nextInt();
Object[]objRef = {new Java3010rbMyClassA(randomNumber)};
System.out.println(new Java3010rbMyClassB().getDataFromObj(objRef[0]));System.out.println(randomNumber);
}//end main}//end class Java3010rb
//======================================================//class Java3010rbMyClassA extends Java3010rb{
private int data;public Java3010rbMyClassA(int inData){
System.out.println("Java3010rb");System.out.println("Dick");
data = inData;}//end constructor
public int getData(){return data;
}//end getData()}//end class Java3010rbMyClassA
//======================================================//class Java3010rbMyClassB{
Java3010rbMyClassB(){System.out.println("Baldwin");
}//end constructorpublic int getDataFromObj(Object refToObj){
return refToObj.getData();}//end getDataFromObj()
}//end class Java3010rbMyClassB |
| Figure 3 . Question 13. |
|---|
Java3010rb
DickBaldwin
120120 |
What is the meaning of the following two images?
This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.
The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.
This image was also inserted for the purpose of inserting space between the questions and the answers.
False: The code shown in Listing 3 produces the compiler error shown in Figure 4 . A cast is required to fix the problem.
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