Create an ArrayList only containing Strings. Print using enhanced for loop
Solution 1
You may want to use below methods to insert and remove:
void add(int index, E element)
E remove(int index)
e.g. Mahendra
is at index 2(index starts from 0), then to add Harry
in front of Mahendra
, just do as below:
names.add(2, "Harry"); //This will push Mahendra at index 3
To remove crrent index 4,
names.remove(4);
To remove previous index 4, which has become index 5 now,
names.remove(5);
Solution 2
indexOf() will let you find position of a given entry, add(index, object) will let you insert at an index.
public static void main(String[] args) {
List<String> names = new ArrayList<String>();
names.add("Mary");
names.add("John");
names.add("Mahendra");
names.add("Sara");
names.add("Jose");
names.add("Judy");
names.add(names.indexOf("Mahendra"), "Harry");
for (String name : names) {
System.out.println(name);
}
}
RazaHuss
Computer Science Major. Freshman. Just getting into learning programming.
Updated on June 13, 2022Comments
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RazaHuss almost 2 years
So here is my program:
Create an ArrayList that will only contain strings Add the following to the list in order
- Mary
- John
- Mahendra
- Sara
- Jose
- Judy
Print the list using the enhanced for loop Insert Harry in front of Mahendra and after John Then Remove position 4 from the list
Here's what I've written:
import java.util.ArrayList; import java.util.Scanner; public class Name { public static void main(String[] args) { ArrayList<String> names = new ArrayList<String>(); Scanner input = new Scanner(System.in); names.add(input.nextLine()); names.add(input.nextLine()); names.add(input.nextLine()); names.add(input.nextLine()); names.add(input.nextLine()); names.add(input.nextLine()); names.add(input.nextLine()); for (String n : names) { System.out.println(n); } } }
I guess I'm having problems with adding and removing. I believe everything else should be fine though.
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Yogendra Singh over 11 years@user1793131: Please don't forget to accept the answer.