Rewrite the following piece of java code using iterator pattern. And change the operation inside the for loop to another operation of your own. And What was the advantage of using the iterator ? import java.util.Iterator
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Rewrite the following piece of java code using iterator pattern. And change the operation inside the for loop to another operation of your own. And What was the advantage of using the iterator ?
import java.util.Iterator
String[ ] originalData = { "one", "two", "three", "four", "five" };
List<String> strings = new ArrayList<>(Arrays.asList(originalData));
for ( int i=0; i<strings.size(); i++) {
// process strings.get(i): here, just print
System.out.println(strings.get(i));
}
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- Use the right loop for the right assignment, using all the follow- ing loops: for, while without hasNext(), while with hasNext() and do-while. So I cannot use array. it has to be done in java.Write a Java program that uses ArrayList and Iterator. It should input from user the names and ages of your few friends in a loop and add into ArrayList. Finally, it should use an Iterator to display the data in a proper format. ( Sample run of the program:-) List of my Friends Enter name and age [friend# 0] Khalid Al-shamri 22.5 Do you want to add another friend (y/n)? y Enter name and age [friend# 1] Rahsed Al-anazi 21.1 Do you want to add another friend (y/n)? y Enter name and age [friend# 2] Salem Al-mutairi 23.7 Do you want to add another friend (y/n)? n Here is the data you entered: 0. Khalid Al-shamri, 22.5 1. Rahsed Al-anazi, 21.1 2. Salem Al-mutairi, 23.7Write this program in Java using a custom method. Implementation details You will implement this program in a specific way in order to gain some experience with loops, arrays and array lists. Use an array of strings to store the 4 strings listed in the description. Use a do-while loop for your 'game engine'. This means the game starts once the user enters money. The decision to stop occurs at the bottom of the loop. The do-while loop keeps going until the user quits, or there is no money left. The pseudocode for this 'game engine' is shown below: determine the fruits to display (step 3 below) and print them determine if there are 3 or 4 of the same image display the results update the customer balance as necessary prompt to play or quit continue loop if customer wants to play and there's money for another game. Use the Random class to generate a random number between 0 and 3. This random number will be an index into the array of strings. Add the string at that index to an…
- Write a Java application CountryList. In the main method, do the following:1. Create an array list of Strings called countries.2. Add "Canada", "India", "Mexico", "Peru" in that order.3. Use the enhanced for loop to print all countries in the array list, one per line.4. Add "Spain" at index 15. Replace the element at index 2 with "Vietnam". You must use the set method.6. Replace the next to the last element with "Brazil". You must use the set method. You willlose one point if you use 3 in the set method. Do this in a manner that would replace thenext to the last element, no matter the size of the array list.7. Remove the object "Canada" Do not remove at an index. Your code should work if"Canada" was at a different location. There is a version of remove method that willremove a specific object.8. Get and print the first element followed by "***"9. Call method toString() on countries to print all elements on one line.10. Use the enhanced for loop to print all countries in the array list,…This is needed in Java Given that an ArrayList of Strings named nameList has already been created and names have already been inserted, write the statement necessary to delete the name at index 15.1. Write a program to input a list of names (strings) from the user and store them in an ArrayList. The input can be terminated by entering the empty string or byentering the string “quit”. 2. Add further functionality to your program so that it searches the ArrayList to find the first string and the last string according to dictionary ordering and then prints out these strings (names). Do this exercise without sorting the names in the ArrayList. For example, if the list contains the following names: Charles Darwin Albert Einstein Issac Newton Tony Hoare Grace Hopper Edgar Dijkstra Ada Lovelace Charles Babbage Stephen Hawking Your program should output:The first name in the list in alphabetical order is: Ada Lovelace The last name in the list in alphabetical order is: Tony Hoare
- Write java program that does the following steps. Part 1: Array list implementation: array list implements list interface plus their own functions. 1. a. Create a ArrayList of type Integer and name it as Grades. b. Create a ArrayList of type String and name it as Students. c. Create a ArrayList of type Double and name it as Results. 2. Add the following values to the array List using add function 30, 40,80 ,100,70,100,10,100,10 Print the size of the array list using size () function. 3.Search for 100 in the array list, if you find it, print a message that “those grades are perfect”. Use only contains function. 4. Repeat the step 3 using equals function. 5. Check if array list is empty or not using isEmpty() function. Print a message if it’s empty and if it’s not empty also. 6. the grade is under 20 which is outlier, remove it from the array list. 7. Print array list using System.out.println() 8. Use indexOf to print index of 80. 9. Use get function. 10. What is the difference between…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.How can you tell whether the performance of an ArrayList is satisfactory?
- Explain the fundamental difference between an array and an arraylist.in java language import java.util.ArrayList;import java.util.Arrays; Write the method named mesh.* * Start with two ArrayLists of String, A and B, each with * its elements in alphabetical order and without any duplicates. * Return a new list containing the first N elements from the two * lists. The result list should be in alphabetical order and without * duplicates. A and B will both have a size which is N or more. * Your solution should make a single pass over A and B, taking * advantage of the fact that they are in alphabetical order, * copying elements directly to the new list.* * Remember, to see if one String is "greater than" or "less than" * another, you need to use the compareTo() method, not the < or > * operators. * * Examples:* mesh(["a","c","z"], ["b","f","z"], 3) returns ["a","b","c"]* mesh(["a","c","z"], ["c","f","z"], 3) returns ["a","c","f"]* mesh(["f","g","z"], ["c","f","g"], 3) returns ["c","f","g"]* * @param a an ArrayList of String in alphabetical order.*…All the problems are to be coded in Python/Java. You must explicitly solve each problem below using your own logic. For example, Do not use existing library functions, such as sum( ), which computes the sum of a list. Instead, you must use for/while loop to sum up the items in a list. a. Write code for a CharList class which converts a string to a linked list of characters in the string. * b. Add a class member function which outputs if the linked list in Problem a. is a palindrome. What is the Big-O upper bound? c. What change could be made to the class definition in Problem a. to make your solution in Problem b. more efficient? Explain. What is the Big-O upper bound? Hint: Think of how the palindrome determination problem is solved for a regular string. d. Add a method to the classic List class we discussed in class that reverses the list. That is, if the original list is A -> B ->C, all of the list's links should change so that C-> B-> A. Make your solution as efficient as possible.…
