Java Programming Practice Questions
Course Introduction
Java Programming is an introductory course designed to equip students with the foundational skills and knowledge necessary to develop robust software applications using the Java programming language. The course covers key programming concepts, including variables, data types, control structures, object-oriented principles, exception handling, and basic data structures. Through hands-on exercises and projects, students gain practical experience in designing, coding, testing, and debugging Java programs, while also learning industry-standard development tools and methodologies. By the end of the course, students will be able to create functional Java applications and have a solid grounding for advanced study in computer science and software engineering.
Recommended Textbook
Java Foundations 3rd Edition by John Lewis
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639 Flashcards
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Chapter 1: Introduction
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Sample Questions
Q1) Syntax rules dictate the form of a program. Semantics dictate the meaning of the program statements.
A)True
B)False
Answer: True
Q2) Which of the following might be included in an IDE?
A) a compiler
B) an editor
C) a debugger
D) all of the above
E) none of the above
Answer: D
Q3) Java is _____________________.
A) a procedural language
B) a functional language
C) an object-oriented language
D) a fourth-generation language
E) a spoken-language
Answer: C
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Page 3
Chapter 2: Data and Expressions
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Sample Questions
Q1) Write a short program that declares a single integer variable called age and assigns it a value equal to your age. Also have it print out your age using the age variable. The output of your program should look similar to the following: I am 30 years old.
Answer: 11edd9cf_f07e_e94c_84e8_d51ecd69a191_TB2841_00
Q2) Explain the difference between the print and the println methods.
Answer: The println method performs a carriage return after printing the specified characters. This means the next output will begin on the next line. The print method does not do this, and therefore the next output will begin right after the previous output.
Q3) Which of the following is not an arithmetic operation in Java?
A) +
B) -
C) *
D) %
E) These are all arithmetic operations in Java
Answer: E
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Chapter 3: Using Classes and Objects
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Sample Questions
Q1) The new operator is used to access an objects methods.
A)True
B)False
Answer: False
Q2) Suppose a Random object has been created called generator. Write a single statement that generates a random number in the range 73 to 100.
Answer: randNum = generator.nextInt(28) + 73;
Q3) Which of the following is an invalid way to instantiate a String object?
A) String title = new String("Java Software Solutions");
B) String name = "John Lewis";
C) String empty = "";
D) String alsoEmpty = new String("");
E) all of the above are valid
Answer: E
Q4) What is the range of integers that will be generated by the following expression? generator.nextInt(15) + 5;
Answer: This expression will generate a random number in the range 5 to 19 (inclusive).
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5
Chapter 4: Conditionals and Loops
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Sample Questions
Q1) What is output by the following code fragment? int num = 0; int max = 10; while(num < max) { System.out.println(num); num += 2; }
Q2) In a nested if statement an else clause is matched to the closest unmatched if. A)True B)False
Q3) Every if statement requires an associated else statement, but not every else statement requires an associated if statement. A)True B)False
Q4) Using a while loop, write a code fragment that computes the sum of the first n natural numbers (i.e. 1, 2, 3, 4, ... n), where n is an integer variable already defined in the program.
Q5) Write a switch statement that switches on an integer variable named val. If val is 2 or 15, then output "Hello World." For all other values, output "Goodbye World."
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Chapter 5: Writing Classes
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Sample Questions
Q1) A(n) ___________________ object is one that is made up, at least in part, of other objects.
A) static
B) aggregate
C) encapsulated
D) private
E) public
Q2) A return statement is not required at the end of every method.
A)True
B)False
Q3) The ________________ reference always refers to the currently executing object.
A) null
B) static
C) final
D) actual
E) this
Q4) Write a method called randomAverage that generates 100 random integers in the range 1 to 100 (inclusive) and returns their average. You may assume that the class has a static Random object called generator already declared and instantiated.
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Chapter 6: Graphical User Interfaces
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Sample Questions
Q1) Explain the difference between check boxes and radio buttons.
Q2) Which of the following components can be toggled on or off using the mouse, indicating that a particular boolean condition is set or unset?
A) check box
B) radio button
C) slider
D) dialog box
E) none of the above
Q3) Check boxes operate as a group, providing a set of mutually exclusive options.
A)True
B)False
Q4) Suppose we have created a class called MyGUI, which represents a GUI. Write a program that creates a JFrame object, adds a MyGUI object to the frame and makes it visible.
Q5) Describe the difference between a heavyweight container and a lightweight container. Give an example of each.
Q6) Write a short class that represents a panel with a single radio button that has the option "Yes" and the option "No." By default, the Yes button should be checked.
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Chapter 7: Arrays
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Sample Questions
Q1) In Java, array indexes begin at 0 and end at one less than the length of the array.
A)True
B)False
Q2) What will be the output of the following code snippet? int[] array = new int[25]; System.out.println(array.length);
A) 26
B) 24
C) 25
D) This code will result in a compile time error.
E) This code will result in a run time error.
Q3) Which of the following lines of code accesses the second element of the first array in a two-dimensional array of integers, numbers, and stores the result in a variable called num?
A) num = numbers[1][2];
B) num = numbers[0][1];
C) num = numbers.getElement(1, 2);
D) num = numbers.getElement(0, 1);
E) none of the above are correct
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Chapter 8: Inheritance
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Sample Questions
Q1) Suppose we create a subclass from a class that has a method called someMethod. If we override someMethod in the subclass, is it possible to access the superclass's version of someMethod? If so, how?
Q2) The process of inheritance should establish a(n) ___________________ relationship.
A) is-a B) has-a C) static D) not-a
E) none of the above
Q3) Explain the relevance of the Object class to the Java programming language.
Q4) What does it mean for a class to be declared as final? What does it mean for a method to be declared as final?
Q5) Once a method is overridden in a subclass, the original version can never be referenced from within the subclass.
A)True
B)False
Q6) Describe the behavior of the toString method and the equals method of the Object class.
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Chapter 9: Polymorphism
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Sample Questions
Q1) What is an interface?
Q2) Which of the following methods are included with any object that implements the Iterator interface?
A) next
B) hasNext
C) toString
D) all of the above
E) a and b
Q3) A parameter to a method can be polymorphic.
A)True
B)False
Q4) The commitment to execute certain code to carry out a method invocation is referred to as _________________.
A) execution
B) binding
C) polymorphism
D) inheritance
E) none of the above
Q5) What is polymorphism?
Q6) Can references to interface types be polymorphic? Explain.
Page 11
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Chapter 11: Recursion
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Sample Questions
Q1) Recursion is necessary.
A)True
B)False
Q2) In Java, it is possible for a method to call itself.
A)True
B)False
Q3) Give a recursive definition of the sum of the first n integers, S(n).
Q4) A method that calls a different method, which then calls the original calling method is a recursive method.
A)True
B)False
Q5) ____________________ recursion occurs when a method calls itself, while _________________ recursion when a method calls another method that then calls the original method.
A) upward, downward
B) downward, upward
C) direct, indirect
D) indirect, direct
E) none of the above
Q6) Write the recursive definition of the factorial of a number.
Page 12
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Chapter 10: Exceptions
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Sample Questions
Q1) What is the difference between a checked exception and an unchecked exception?
Q2) What is exception prorogation, and how does it work in Java?
Q3) Which of the following methods are part of the Exception class and can be used to give information about a thrown exception?
A) getInfo
B) printInfo
C) printStackTrace
D) getStackTrace
E) none of the above
Q4) The Exception class and the Error class are subclasses of the ___________________ class.
A) Throwable
B) Catchable
C) RuntimeProblem
D) CompilerProblem
E) none of the above
Q5) Is the Exception class a subclass of the Error class? Explain.
Q6) How does a method throw an exception?
Q7) What is the difference between an exception and an error?
Q8) Is an exception an object? Explain.
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Chapter 12: Searching and Sorting
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Sample Questions
Q1) As the number of items in a search pool grows, the number of comparisons required to search _______________ .
A) increases
B) decreases
C) stays the same
D) goes to 0
E) none of the above
Q2) ____________________ is the process of arranging a group of items into a defined order.
A) Searching
B) Sorting
C) Selecting
D) Helping
E) none of the above
Q3) Write a method that accepts an integer and an array of integers, and returns true if the integer is contained in the array. You may assume that the array is sorted, and your method should use a binary search..
Q4) Write a method that accepts an integer array as a parameter and sorts it using the bubble sort algorithm.
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Chapter 13: Trees
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Sample Questions
Q1) One method of implementing a tree using an array involves storing the child of the element at the index n in the array at indexes
A) n+1 and n+2
B) 2<sup>n</sup> and 2<sup>2n</sup>
C) 2n+1 and 2n+2
D) n-1 and n-2
E) none of the above will work
Q2) A binary tree is a tree in which any node can have at most two children.
A)True
B)False
Q3) Which of the following traversals is not easily implemented recursively?
A) Preorder
B) Inorder
C) Postorder
D) Level-order
E) all of the above are easily implemented recursively
Q4) What might be the difference between a complete binary tree and a full binary tree?
Q5) Explain the implementation of an postorder traversal.
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Chapter 14: Introduction to Collections and Stacks
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Sample Questions
Q1) What is the fundamental difference between radix sort and the other sorting techniques that have been studies.
Q2) Suppose there were no count variable stored for the linked implementation of a queue. Would it still be possible to implement a constant time size operation? How about if there were no count variable stored for an array based implementation of a queue?
Q3) A stack is the ideal collection to use when _______________________ .
A) implementing a radix sort
B) evaluating a postfix expression
C) evaluating an infix expression
D) implementing a quick sort
E) none of the above
Q4) Write an enqueue method for a queue implemented as a circular array. You may assume that you have access to a method called expandCapacity that will double the size of the array if necessary. The class has instance variables front and rear, which represent the indexes of the front and rear of the queue. It also has an integer variable called count that represents the number of elements in the queue, as well as an array of generic T types called queue that represents the queue.
Q5) List the five basic operations on a stack.
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Chapter 15: Heaps and Priority Queues
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Sample Questions
Q1) In a balanced binary search tree, adding an element always requires approximately O(log<sub>2</sub> n) steps.
A)True B)False
Q2) A heap sort sorts elements by constructing a heap out of them, and then removing them one at a time from the root.
A)True B)False
Q3) In a binary search tree, a new element is always added as a leaf. A)True B)False
Q4) The most efficient binary search trees are balanced. A)True B)False
Q5) Suppose we have a class called BinaryTree that includes a find method. If we extend the class to create a BinarySearchTree class, should we override the find method or use it as is? Explain.
Q6) Describe how to find an element in a binary search tree. You may use English sentences or pseudocode.
17
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Chapter 16: Graphs
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Sample Questions
Q1) A spanning tree of a graph is a tree with that always has which of the following properties?
A) It includes some of the edges and some of the vertices of the graph.
B) It includes all of the edges and some of the vertices of the graph.
C) It includes some of the edges and all of the vertices of the graph.
D) It includes all of the edges and all of the vertices of the graph.
E) none of the above
Q2) In a(n) _____________________ graph, an edge from node labeled A to a node labeled B is the same as having an edge from B to A.
A) directed
B) undirected
C) sparse
D) tree-like
E) none of the above
Q3) Explain how a breadth-first traversal of a graph works.
Q4) Write out all of the edges in a complete graph on 4 vertices.
Q5) A digraph and an directed graph are the same thing.
A)True
B)False
Q6) What does it mean for a graph to be connected?
Page 18
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