Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
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Is there a method in the String class that returns the number of characters in the string? If so, what is it called, and what are its parameters?
Complete the class LeetMaker class using String methods. Remember that all the String methods are accessors. They do not change the original String. If you want to apply multiple methods to a String, you will need to save the return value in a variable.
Complete the class by doing the following:
Print the word in lowercase
Replace "e" with "3" (Use the unmodified variable word)
Print the changed word
In the changed word, replace: "t" with "7"
Print the changed word
In this newest changed word, replace: "L" with "1" (uppercase L with the number 1). Then, print the final changed word (with all the replacements)
Print the length of the word
The code to print the original word is already included for you. Do not change that statement. You will need to use the replace() method multiple times. Then print the final String. Remember that replace is an accessor method; It returns the changed version of the String. If you want to do something with the returned String - like use replace() on…
Does any method in the string object change the contents of the string?
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- In some circumstances, a class is reliant on itself. That is, one class's object interacts with another class's object. To accomplish this, a method of the class may accept an object of the same class as a parameter.The String class's concat function is an example of this situation. The method is called by one String object and receives another String object as an argument. Here's an illustration:str3 is equal to str1.concat(str2);The method's String object (str1) appends its characters to those of the String supplied as a parameter (str2). As a consequence, a new String object is returned and saved as str3. Create Java code to implement the conditions given.arrow_forwardMethod called reverse that reverses a string passed to this method as a parameter and returns the reversed string. Eg reverse(“string”) should return “gnirts”. Print out the reversed string in your main method. Hint: Use CharAt or Substring methods from the String Class.arrow_forwardJAVAA7-Write a class with a constructor that accepts a String object as its argument. The class should have a method that returns the number of vowels in the string, and another method that returns the number of consonants in the string. Demonstrate the class in a program by invoking the methods that return the number of vowels and consonants. Print the counts returned.arrow_forward
- Implement the class Character The role should be “primary” or “secondary” all other values are not acceptable. Considercapital and small letters variance. The gender should be “m” or “M” for male or “f” or “F” for female. The age should be a positive value. The giveRaise method increase the salary of a character by a given percentage with amaximum salary of 10000. The toString method returns a string that describes the character. For example: [Elisabeth Kane, female, 35, primary,4500$] 2) Implement the class Play A Play can have at most 20 characters. The real number of characters is registered in nbOfCharacters and is updated automaticallywhen a new character is added. AddCharacter method adds a new character to the characters array and updates thenbOfCharacters value. The attribute nbPlay keeps track of the number of Plays created. The toString method returns a string description of the play including name, genre and thenames of all the characters.Example: [The Opera…arrow_forwardDifferentiate parameters passing method i.e, by line, by reference, by parameter? with suitable examples.arrow_forward2. Write a method isPalidrome(String arg) that determines if a String is palindrome or not. Palindrome is when a String remains the same after reversing. The method should return boolean type. For example: MADAM is palindrome.arrow_forward
- Why is it asserted that the String class's length() method does not deliver accurate results?arrow_forwardIn java language Before we write a class which is used to describe objects, let’s practice manipulating an object by calling its methods. Complete the class LeetMaker class using String methods. Remember that all the String methods are accessors. They do not change the original String. If you want to apply multiple methods to a String, you will need to save the return value in a variable. Complete the class by doing the following: Print the word in lowercase Replace "e" with "3" (Use the unmodified variable word) Print the changed word In the changed word, replace: "t" with "7" Print the changed word In this newest changed word, replace: "L" with "1" (uppercase L with the number 1). Then, print the final changed word (with all the replacements) Print the length of the word The code to print the original word is already included for you. Do not change that statement. You will need to use the replace() method multiple times. Then print the final String. Remember that replace is an…arrow_forwardWhen passing a property on to a method in the form of a parameter, there is one requirement that absolutely must be satisfied on your end. What precisely is it going to be used for?arrow_forward
- JAVA Practice Question for Midterm Write a class with a constructor that accepts a String object as its argument. The class should have a method that returns the number of vowels in the string, and another method that returns the number of consonants in the string. Demonstrate the class in a program by invoking the methods that return the number of vowels and consonants. Print the counts returned. Imagine you are developing a software package for an online shopping site that requires users to enter their own passwords. Your software requires that users’ passwords meet the following criteria: The password should be at least six characters long. The password should contain at least one uppercase and at least one lowercase letter. The password should have at least one digit. a program that asks the user to enter a password, then displays a message indicating whether it is valid or not.arrow_forwardWrite a method specification for the method below.public String getDefinitionFromDictionary(String word)arrow_forwardWrite a method that will have a C++ string passed to it. The string will be an email address and the method will return a bool to indicate that the email address is valid. Email Validation Rules: ( These rules are not official.) No whitespace allowed 1 and only 1 @ symbol Must not start with the @ symbol At least 1 period after the @ symbol. Must not start with a period after the @ symbol Program will prompt for an email address and report if it is valid or not according to the rules posted above. The program will loop and prompt me to continue.arrow_forward
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