[Java] ArrayList

As I was writting the Voucher Reporting Tool for GE Aviation, the process of storing data in arrays became more and more tedious. Every time I wanted to add another engine, or remove a DAN #, I have to write all those codes to create a new array, filling it in, arranging it and such. Why can’t arrays be resized? Anyway, I turned to the ArrayList class, which I should have been a long time ago.

I guess it is similar to the Data Structure called Linked List, but all coded out by other devs and ready for use. Here’s a simple example.


import java.util.ArrayList;

public class Testing {

public static void main(String[] args) {

//Defining the Array List
ArrayList list = new ArrayList();

//Adding Elements in Order
list.add("One");
list.add("Two");
list.add("Three");
list.add("Four");
list.add("Five");

//Add Element at a certain Index
list.add(2, "Two and a Half");

//Revoce Element by Index Number
list.remove(list.size()-2);

//Remove Element by supplying the Object
list.remove("Five");

//Retrieve Elements in the Array List
for(int i = 0; i < list.size(); i ++)
System.out.println(list.get(i));

//Search for a certain Element Index
System.out.println("Two is at position: "+list.indexOf("Two"));

}
}

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