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Revised: Sun Apr 03 10:26:37 CDT 2016
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This module contains review questions and answers keyed to the module titled Java3010: Indirection, Array Objects, and Casting .
The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.
True or False? The code shown in Listing 1 produces the output shown in Figure 1 where the numeric values are random and vary from one run to the next.
| Listing 1 . Question 1. |
|---|
/*File Java3010ra Copyright 2013, R.G.Baldwin
Rev 02/14/13*********************************************************/
import java.util.*;class Java3010ra{
public static void main(String[]args){
Random generator = new Random(new Date().getTime());int randomNumber = (byte)generator.nextInt();
Object[]objRef = [new Java3010raMyClassA(randomNumber)];System.out.println(
new Java3010raMyClassB().getDataFromObj(objRef[0]));System.out.println(randomNumber);
}//end main}//end class Java3010ra
//======================================================//class Java3010raMyClassA extends Java3010ra{
private int data;public Java3010raMyClassA(int inData){
System.out.println("Java3010ra");System.out.println("Dick");
data = inData;}//end constructor
public int getData(){return data;
}//end getData()}//end class Java3010raMyClassA
//======================================================//class Java3010raMyClassB{
Java3010raMyClassB(){System.out.println("Baldwin");
}//end constructorpublic int getDataFromObj(Object refToObj){
return ((Java3010raMyClassA)refToObj).getData();}//end getDataFromObj()
}//end class Java3010raMyClassB |
| Figure 1 . Question 1. |
|---|
Java3010ra
DickBaldwin
-37-37 |
True or False? All array objects in Java contain one-dimensional array structures.
True or False? Each array in Java is encapsulated in an array object. An array object must be accessed using a reference to the array object.
True or False? When the declared type of an array is one of the eight primitive types, the actual values are stored in the array elements in the array object.
True or False? When the declared type of an array is the type of an object (array object or ordinary object) , those objects are stored in the array elements.
True or False? Unless code is written to do otherwise, the elements in a new array object are initialized with the standard default values for the types involved (zero, true, or null) .
True or False? The array structure that is encapsulated in an array object must have one, or more elements.
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