What is true after the execution of the following code? ArrayList arrayList = new ArrayList(); arrayList.add("a"); arrayList.add("b"); arrayList.add("c"); System.out.println(arrayList.remove("x")); a.none of these is correct b.-1 is printed c.false is printed d.the code will not compile e.an exception is thrown

What is true after the execution of the following code? ArrayList arrayList = new ArrayList(); arrayList.add("a"); arrayList.add("b"); arrayList.add("c"); System.out.println(arrayList.remove("x")); a.none of these is correct b.-1 is printed c.false is printed d.the code will not compile e.an exception is thrown

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter9: Advanced Array Concepts

Section: Chapter Questions

Problem 18RQ

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Arrays: create an array of a given type and populate its values. Use of for loop to traverse through an array to do the following : to print the elements one by one, to search the array for a given value. ArrayList: create an ArrayList containing elements of a given type . Use some of the common ArrayList methods to manipulate contents of the ArrayList. Write methods that will take an ArrayList as its parameter/argument ; and/or return an ArrayList reference variable as its return type. Searching for an object in an Array: Loop through the ArrayList to extract each object and to check if this object’s attribute has a given value. Explain how and why interfaces are used in Java Collection Framework. Explain the major differences between a Stack and a Queue. Be able to use stack and queue methods. What is meant by O(N) notation? Express the complexity of a given code using the O(N) notation.
Write code that creates an ArrayList that can hold String objects. Add the names of three cars to the ArrayList, and then display the contents of the ArrayList.
How can you tell whether the performance of an ArrayList is satisfactory?
public static ArrayList findExactString(String s, ArrayList myArray) { return null; } // Use the above method, findExactString, as a helper method to implement addWithoutDuplication method. The addWithoutDuplication method has the following properties: 1- It takes two arguments, a string s and an ArrayList myArray of type string. 2- It returns an integer which represents the number of occurrences of the string s in myArray while attempting to add it. 3- If myArray is null, it returns -1 4- If adds the string s to the end of the ArrayList myArray if the string s is not already there. public static int addwithout Duplication(String s, ArrayList myArray) { return -1;
Explain the fundamental difference between an array and an arraylist.
Project Description: In this project you implement an ArrayStack ADT and use the stack for implementing the following methods: a) Reverse an array of Words: Accept an array of words as input parameter and return an array of words in reverse order. Use the method signature: public static String[] reverseWords (String[] wordList) Example Input: Bird Cat Dog Elephant Output: Elephant Dog Cat Bird
Project Description: In this project you implement an ArrayStack ADT and use the stack for implementing the following methods: a) Reverse an array of Words: Accept an array of words as input parameter and return an array of words in reverse order. Use the method signature: public static String[] reverse Words (String[] wordList) Example Input: Bird Cat Dog Elephant Output: Elephant Dog Cat Bird
Question 4 Write Java code for the following: a. Create an Arraylist that can hold Integer objects. b. Check and display whether the Arraylist is empty or not. c. Add an element 50 into the Arraylist. d. Add another element 60 in the position of 0 in the Arraylist. e. Replace the element to 70 in index 1.
4. Now examine the ArrayList methods in the above table, a) Which method retrieves elements from the ArrayList? b) Which method replaces the value of an element that already exists in the ArrayList? c) Which two methods initializes the value of an element? d) How do the two methods in (c) differ? Which method(s) would be appropriate in the above Java program (after we convert it to work with ArrayLists)?
How to measure the performance of an ArrayList?
Write Java code for the following: a. Create an Arraylist that can hold Integer objects. b. Check and display whether the Arraylist is empty or not. C. Add an element 50 into the Arraylist. d. Add another element 60 in the position of 0 in the Arraylist. e. Replace the element to 70 in index 1.
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