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Test Bank For Building Java Programs: A Back to Basics Approach 5th Edition All Chapters - 9780135472118
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,TestBank For Building Java Programs: A Back to Basics Approach 5th EditionFinal 1
Sample Final Exam #1
(Spring 2005; thanks to Stuart Reges)
1. Array Mystery
Consider the following method:
public static void arrayMystery(int[] a) {
for (int i = 1; i < a.length; i++) {
a[i] = i + a[i - 1] - a[i];
}
}
Indicate in the right-hand column what values would be stored in the array after the method arrayMystery executes
if the integer array in the left-hand column is passed as a parameter to it.
Original Contents of Array Final Contents of Array
int[] a1 = {7};
arrayMystery(a1); _____________________________
int[] a2 = {4, 3, 6};
arrayMystery(a2); _____________________________
int[] a3 = {7, 4, 8, 6, 2};
arrayMystery(a3); _____________________________
int[] a4 = {10, 2, 5, 10};
arrayMystery(a4); _____________________________
int[] a5 = {2, 4, -1, 6, -2, 8};
arrayMystery(a5); _____________________________
1
,TestBank For Building Java Programs: A Back to Basics Approach 5th Edition
Final 1
2. Reference Semantics Mystery
The following program produces 4 lines of output. Write the output below, as it would appear on the console.
public class BasicPoint {
int x;
int y;
public BasicPoint() {
x = 2;
y = 2;
}
}
public class ReferenceMystery {
public static void main(String[] args) {
int a = 7;
int b = 9;
BasicPoint p1 = new BasicPoint();
BasicPoint p2 = new BasicPoint();
addToXTwice(a, p1);
System.out.println(a + " " + b + " " + p1.x + " " + p2.x);
addToXTwice(b, p2);
System.out.println(a + " " + b + " " + p1.x + " " + p2.x);
}
public static void addToXTwice(int a, BasicPoint p1) {
a = a + a;
p1.x = a;
System.out.println(a + " " + p1.x);
}
}
2
, TestBank For Building Java Programs: A Back to Basics Approach 5th Edition
Final 1
3. Inheritance Mystery
Assume that the following classes have been defined:
public class A extends B { public class C {
public void method2() { public String toString() {
System.out.print("a 2 "); return "c";
method1(); }
}
} public void method1() {
System.out.print("c 1 ");
public class B extends C { }
public String toString() {
return "b"; public void method2() {
} System.out.print("c 2 ");
}
public void method2() { }
System.out.print("b 2 ");
super.method2(); public class D extends B {
} public void method1() {
} System.out.print("d 1 ");
method2();
}
}
Given the classes above, what output is produced by the following code?
C[] elements = {new A(), new B(), new C(), new D()};
for (int i = 0; i < elements.length; i++) {
System.out.println(elements[i]);
elements[i].method1();
System.out.println();
elements[i].method2();
System.out.println();
System.out.println();
}
3
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