CS 1063  Week 15:  Final Review  

Objectives

Assignments

Material to Review

For Java programming, review the labs, the projects, and the activities from the lecture notes.  Some of these will likely be part of the exam.

For general knowledge, review Chapters 1-5, Sections 7.1-7.4, Supplement 3G, your quizzes, and the lecture notes.  Understanding the chapter summaries and self-check problems is a good way to start reviewing the book material.  Below is a table of particular items to pay attention to:

  Reading     Chapter Summary     Self-Check Problems  
Chapter 1 Everything 6, 8, 11, 13, 15-17, 19-21
Chapter 2 Everything 1-2, 6-7, 11-12, 14-15, 21, 27
Chapter 3 Everything 2-3, 7, 10-12, 14-15, 18-19
Supplement 3G     Everything 2-3
Chapter 4 Everything except System.out.printf 1-5, 7, 13, 17, 23-24
Chapter 5 Everything except do/while 1-2, 4-5, 12-13, 14-15, 17, 23
Chapter 7 Everything except multidimensional arrays 1, 3-4, 6-7, 11-13, 15, 25
Note: All the Self-Check Problems are good to do.  The above selects a subset of them as examples of what to study.

Lists of Terminology, Notation, and Keywords

Terminology

array
array element
array traversal
assignment statement    
cast
class
comment
compiler
counter
cumulative algorithm
data type
declaration
exception
expression
fencepost loop
flow of control
identifier
if statement
index
index out of bounds    
keyword
loop
method
method call
object
operator
parameter
precedence
procedural decomposition
pseudocode
reference
return type
scope
statement
test
variable

Notation

!
!=
" "
%
&&
' '
( )      
*
*=
+
++
+=       
,
-
--
-=
.
/
/* */    
//
/=
;
<
<=
=
==       
>
>=
[ ]
\"
\\
\n
\t
{ }
||

Keywords

boolean    
char
double
else
equals
false
final
for
if
import      
int
main
new
null
println
public class
public static    
return
true
void
while
Graphics
Math
Random
Scanner
String

Additional Activities

Write a Java program that draws the following pattern on a DrawingPanel:
A DrawingPanel with blue circles centered at (0,0) and red circles centered at (300,0)
Hint: Draw blue circles centered at (0,0) and red circles centered at (300,0).
Write a Java program that inputs three doubles from the user.  Write and test methods for one or more of the following tasks.
  • Return the mininum of the three numbers.  Write one version using Math.min and another version using if statements.  [See Self-Check Problem 12 in Chapter 3.]

  • Return the median of the three numbers.

  • Return true if all three numbers are equal to each other.

  • Return true if all three numbers are different from each other.

  • Return true if two of the three numbers are negative.
Write a Java program that inputs a token from the user and determines whether the user entered an int, double, or a String.  Hint: Use the hasNextInt and hasNextDouble methods of Scanner.  [See the ExamineInput1 program on p. 335.]
Write a Java program that inputs Strings from the user until the user enters the first String again.

Answer: 

import java.util.*;
public class StringAgain {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        System.out.print("Enter the first string:");
        String first = console.next();
        String next = "";  // priming the loop
        while (! first.equals(next)) {
            System.out.print("Enter the next string:");
            next = console.next();
        }
    }
}
What will be the difference if the nextLine method is used instead of the next method?

Some variations on this task include:

  • Write a Java program that inputs Strings from the user until the user enters a different String.

  • Write a Java program that inputs Strings from the user until the user enters a String that contains a 'z'.

  • Write a Java program that inputs Strings from the user until the user enters the same String twice in a row.
Write a Java program that inputs an int from the user and determines how many times the number is divisible by 2.  The program should keep dividing the number by 2 until the number is odd.  [See Self-Check Problem 4 in Chapter 5.]
Write a Java program to input doubles from the user for an array.  First ask the user how long the array should be.  [See the Temperature2 program on p. 436.]

Write and test methods for one or more of the following tasks.

  • Return the sum of the array.

    Answer: 

    public static double sumArray(double[] list) {
    double sum = 0;
    for (int i = 0; i < list.length; i++) {
        sum += list[i];
    }
    return sum;
}

  • Return the maximum element of the array.  [See Self-Check Problem 7 in Chapter 7.]

  • Increment every element in the array.  [See p. 440 and p. 463.]

  • Replace negative elements with zeroes.

  • Return the number of elements that are negative.

  • Return true if every element is negative.

    Answer: 

    public static boolean allNegative(double[] data) {
    int count = 0;
    for (int i = 0; i < data.length; i++) {
        if (data[i] < 0) {
           count++;
        }
    }
    return (count == data.length);
}
    This code serves as a hint for the previous and next tasks in this list.

  • Return true if most of the elements are negative.
This is based on Self-Check Problem 25 in Chapter 7.

Write a method that computes the average String length of an array of Strings.  For example, the array {"Write", "a", "method", "in", "Java"} has an average length of 3.6.  Write a Java program that tests your method.