Questions and Answers of Java How to Program Early Objects

Fill in the blanks in each of the following statements:a) Java programs normally go through five phases _________., _________., _________., _________ and _________.b) A(n) _________ provides many
Fill in the blanks in each of the following statements:a. The international standard database language is .b. A table in a
Two problems that can occur in systems that al- low threads to wait are deadlock, in which one or more threads will wait forever for an event that cannot occur, and indefinite postponement, in which
List the reasons for entering the blocked state. For each of these, describe how the program will normally leave the blocked state and enter the runnable state.
Discuss each of the following terms in the context of Java’s threading mechanismsa) synchronizedb) waitc) notifyd) notifyAlle) Lockf) Condition
Define each of the following terms.a) Threadb) Multithreadingc) Runnable stated) Timed waiting statee) Preemptive schedulingf) Runnable interfaceg) Producer/consumer relationshiph) Quantum
State whether each of the following is true or false. If false, explain why.a) Method sleep does not consume processor time while a thread sleeps.b) JavaFX components are thread safe.c) Declaring a
State whether each of the following is true or false. If false, explain why.a) To determine the difference between two Instants, use class Duration’s static method difference, which returns a
State whether each of the following is true or false. If false, explain why.a) A thread is not runnable if it has terminated.b) Some operating systems use timeslicing with threads. Therefore, they
Fill in the blanks in each of the following statements:a. Method
Fill in the blanks in each of the following statements:a. A thread enters the terminated state when .b. To
State whether each of the following is true or false. If false, explain why.a) Each CSS rule begins with a CSS collector which specifies the JavaFX objects that will be styled according to the
Fill in the blanks in each of the following statements:a. Selectors that begin with
One problem with the binary tree sort is that the order in which the data is inserted affects the shape of the tree—for the same collection of data, different orderings can yield binary trees of
Our linked-list implementation (Fig. 21.3) used both a firstNode and a lastNode. The lastNode was useful for the insertAtBack and removeFrom- Back methods of the List class. The insertAtBack method
In this chapter, we saw that duplicate elimination is straightforward when creating a binary search tree. Describe how you’d perform duplicate elimination when using only a one-dimensional array.
Provide the inorder, preorder and postorder traversals of the binary search tree of Fig. 21.1.Fig. 21.1. 49 28 83 18 40 71 97 11 19 32 44 69 72 92 99
Comment on how each of the following entities or concepts contributes to the reusability of data structures:a) Classesb) Composition
What are the differences between a stack and a queue?
What are the differences between a linked list and a stack?
Fill in the blanks in each of the following statements:a. A self-
Fill in the blanks in each of the following:a. and enable you to
State whether each of the following is true or false. If false, explain why.a) A generic method cannot have the same method name as a nongeneric method.b) All generic method declarations have a
Implement bubble sort—another simple yet inefficient sorting technique. It’s called bubble sort or sinking sort because smaller values gradually “bubble” their way to the top of the array
Fill in the blanks in each of the following statements:a. A selection sort application would take approximately times as
What does the following program do? // Exercise ANS: : SomeClass.java public class SomeClass { public static String someMethod(int[] array2, int x)
What does the following program do? public class MysteryClass { public static int mystery(int[] array2, int size) { if (size == 1) { return
Find the error(s) in the following recursive method, and explain how to correct it (them). This method should find the sum of the values from 0 to n. public int sum(int n) {
What does the following code do? public int mystery(int a, int b) { if (b == 1) { return a; } else { return a +
Fill in the blanks in each of the following statements:a.
Iteration and recursion each involve a(n) .a. Iteration statementb. Termination testc. Counter variabled. None of the above
Each time a fractal’s pattern is applied, the fractal is said to be at a new .a. Widthb. Heightc. Leveld. Volume
The first call to invoke a recursive method is ______.a) Not recursiveb) Recursivec) The recursion stepd) None of the above
A is needed to terminate recursion.a. Recursion stepb. Break statementc. Void return typed. Base case
State whether each of the following is true or false. If false, explain why.a) A method that calls itself indirectly is not an example of recursion.b) Recursion can be efficient in computation
Assuming that random is a SecureRandom object, explain in detail the stream pipeline: random.ints(1000000, 1, 3) .boxed()
Assuming that list is a List, explain in detail the stream pipeline: list.stream() .filter(value -> value % 2 != 0) .reduce(0, Integer::sum)
What’s wrong with the following stream pipeline? list.stream() .filter(value -> value % 2 != 0) .sum()
Write a lambda or method reference for each of the following tasks:a) Write a lambda expression that receives two double parameters a and b and returns their product. Use the lambda form that
State whether each of the following is true or false. If false, explain why.a) An intermediate operation specifies tasks to perform on the stream’s elements; this is efficient because it avoids
Fill in the blanks in each of the following statements:a. Stream
Write a lambda or method reference for each of the following tasks:a) Write a lambda that can that can be passed to a method with an IntConsumer parameter. The lambda should display its argument
State whether each of the following is true or false. If false, explain why.a) Lambda expressions can be used anywhere functional interfaces are expected.b) Terminal operations are lazy—they
Fill in the blanks in each of the following statements:a. Lambda expressions implement .b. With
Determine whether each of the following statements is true or false. If false, explain why.a) Elements in a Collection must be sorted in ascending order before a binarySearch may be performed.b)
Explain briefly the operation of each of the following methods of class HashMap:a) putb) getc) isEmptyd) containsKeye) keySet
Explain why inserting additional elements into an ArrayList object whose current size is less than its capacity is a relatively fast operation and why inserting additional elements into an ArrayList
Define each of the following terms:a) Collectionb) Collectionsc) Comparatord) Liste) load factorf) collisiong) space/time trade-off in hashingh) HashMap
Determine whether each statement is true or false. If false, explain why.a) Values of primitive types may be stored directly in a collection.b) A Set can contain duplicate values.c) A Map can contain
Fill in the blanks in each of the following statements:a. A(n)
Write a statement that performs each of the following tasks:a) Output an Accounts object named accounts using XML serialization and a Buffered- Writer named writer.b) Input an XML serialized object
Complete the following tasks, assuming that each applies to the same program:a) Write a statement that opens file "oldmast.txt" for input—use Scanner variable in- OldMaster.b) Write a statement
Determine whether each of the following statements is true or false. If false, explain why.a) You must explicitly create the stream objects System.in, System.out and System.err.b) When reading data
For each of the following, write a single statement that performs the indicated task:a) Compare the string in s1 to the string in s2 for equality of contents.b) Append the string s2 to the string s1,
State whether each of the following is true or false. If false, explain why.a) When String objects are compared using ==, the result is true if the Strings contain the same values.b) A String can be
State whether each of the following is true or false. If false, explain why:a) In general, a node’s size should be defined explicitly.b) A node’s position should be defined relative to its parent
Fill in the blanks in each of the following:a. You add multiple RadioButtons to a(n) to ensure that only one RadioButton in
State whether each of the following is true or false. If false, explain why.a) You must create JavaFX GUIs by hand coding them in Java.b) The layout VBox arranges components vertically in a scene.c)
Fill in the blanks in each of the following statements:a. A(n) can display text and accept text input from the user.b.
Until this chapter, we’ve found dealing with errors detected by constructors to be a bit awkward. Explain why exception handling is an effective means for dealing with constructor failure.
List the various exceptional conditions that have occurred in pro- grams throughout this text so far. List as many additional exceptional conditions as you can. For each of these, describe briefly
What happens to a local reference in a try block when that block throws an Exception?
What does the statement throw exceptionReference do in a catch block?
What happens when a catch block throws an Exception?
What is the key reason for using finally blocks?
Why would a programmer specify a superclass type as the type in a catch block?
What happens if several catch blocks match the type of the thrown object?
What happens if no catch handler matches the type of a thrown object?
Should a conventional application catch Error objects? Explain.
Give a key advantage of using catch(Exception exceptionName).
If no exceptions are thrown in a try block, where does control proceed when the try block completes execution?
Why are exceptions particularly appropriate for dealing with errors produced by methods of classes in the Java API?
List five common examples of exceptions.
Why is it useful to be able to add private methods to interfaces?
Why is it useful to be able to add static methods to interfaces?
What is a functional interface?
Explain how default methods enable you to add new methods to an existing interface without breaking the classes that implemented the original interface.
Discuss three proper ways in which you can assign superclass and subclass references to variables of superclass and subclass types.
What are abstract methods? Describe the circumstances in which an abstract method would be appropriate.
Fill in the blanks in each of the following statements:a. In Java SE 8, an interface may declare —that
Fill in the blanks in each of the following statements:a. If a class contains at least one abstract method, it’s a(n)
In Figs. 9.10–9.11 methods earnings and to- String each call various get methods within the same class. Explain the benefits of calling these get methods within the classes.
Explain why you would use super in the body of a subclass’s instance method.
Explain why you would use super in the first statement of a subclass constructor’s body.
Write a line of code that performs each of the following tasks:a) Specify that class PieceWorker inherits from class Employee.a) Call superclass Employee’s toString method from subclass
a) Assume that the following method call is located in an overridden earnings method in a subclass:super.earnings()b) Assume that the following line of code appears before a method
Write a line of code that performs each of the following tasks:a) Specify that class PieceWorker inherits from class Employee.b) Call superclass Employee’s toString method from subclass
What Does Each Code Snippet Do?a. Assume the following method call is in an overridden earnings method in a subclass:super.earnings()b.Assume that the following line of code appears before
State whether each of the following is true or false. If a statement is false, explain why.a. Superclass constructors are not inherited by subclasses.b. A has-a relationship is implemented
Fill in the blanks in each of the following statements:a.
What happens when a return type, even void, is specified for a constructor?
Explain the notion of package access in Java. Explain the negative aspects of package access.
Fill in the blanks in each of the following statements:a. A(n) imports all static members of a class.b.
Label the elements of three-by-five two-dimensional array sales to indicate the order in which they’re set to zero by the following program segment:for (int row = 0; row < sales.length; row++)
Consider a two-by-three integer array t.a) Write a statement that declares and creates t.b) How many rows does t have?c) How many columns does t have?d) How many elements does t have?e) Write access
Determine whether each of the following is true or false. If false, explain why.a) To refer to a particular location or element within an array, we specify the name of the array and the value of the
Fill in the blanks in each of the following statements:a. One-dimensional array p contains four elements. The names of those elements are __________, __________, __________ and
Find and correct the error in each of the following program segments:a)final int ARRAY_SIZE = 5;ARRAY_SIZE = 10;b) int[] b = new int[10]; for (int i = 0; i <= b.length;
Determine whether each of the following is true or false. If false, explain why.a. An array can store many different types of values.b. An array index should normally be of type float.c.
Write statements that will display a random number from each of the following sets: a) 2, 4, 6, 8, 10.b) 3, 5, 7, 9, 11.c) 6, 10, 14, 18, 22.

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