3 ArrayLists 3.1 Write code that creates an ArrayList<Integer> object named list
ID: 2246992 • Letter: 3
Question
3 ArrayLists
3.1 Write code that creates an ArrayList<Integer> object named list and fills list with these numbers (using one or a pair
of for or while loops):
0 1 2 3 4 0 1 2 3 4
3.2 Consider the ArrayList<Integer> object named list containing these Integers:
list = { 1, 2, 3, 4, 5, 4, 3, 2, 1, 0 }
What are the contents of list after this loop completes?
for (int i = 1; i < 10; ++i) {
list.set(i, list.get(i) + list.get(i-1));
}
3.3 Write an enhanced for loop that counts how many numbers in an ArrayList<Integer> object named list are negative.
Print the count after the loop terminates.
3.4 Write a method named arrayListSum() that has one parameter pList which is an object of the class ArrayList
<Integer>. The method shall return the sum of the elements of pList.
3.5 Write a method named named arrayListCreate() that has two int parameters pLen and pInitValue. The method shall
create and return a new ArrayList<Integer> object which has exactly pLen elements. Each element shall be initialized
to pInitValue.
3.6 Write a void method named insertName() that has two input parameters: (1) pList which is an object of ArrayList
<String> where each element of pList is a person's name; and (2) a String object named pName. Assume the names in
pList are sorted into ascending order. The method shall insert pName into pList such that the sort order is maintained.
3.7 Write a void method named arrayListRemove() which has two parameters: pList is an object of the ArrayList
<Integer> class and pValue is an int. The method shall remove all elements from pList that are equal to pValue.
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Explanation / Answer
Answer for 3.1: This is the coding for array list using one or pair of for or while loops
ArrayList<Integer> list=new ArrayList<Integer>(10); //creating an an object
for(int i=0;i<5;++i)
{ // perform iteration
list.add(i); //adding elements to list
}
for(int i=0;i<5;++i)
{
list.add(i); //adding elements to list
}
When we write above code in c language:
#include<stdio.h>
#include<conio.h>
main(){
int i,a[10];
for(i=0;i<5;++i){
printf(“%d”,i);}
for(i=0;i<5;++i){
printf(“%d”,i);}
getch();}
Answer for 3.4 question: this is actual part of coding
public int arrayListSum(ArrayList<Integer>plist) //method with access modifier public(access any where)
{
int sum=0; //initialization
for(int i=0;i<plist.size();i++){
sum +=plist.get(i); //getting list of elements and performing sum
}
return sum; //moving back to sum for perform operation until satisfy the condition
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