LinkedLists trying to call the class
I am very new to linked lists, but I currently have a linked list of objects and I am lost on how I would call a method on others using one of the objects in the linked list.
public Store() {
products.add(new Product("Whiteboard Marker", 85, 1.50));
products.add(new Product("Whiteboard Eraser", 45, 5.00));
products.add(new Product("Black Pen", 100, 1.50));
products.add(new Product("Red Pen", 100, 1.50));
products.add(new Product("Blue Pen", 100, 1.50));
}
these are my current objects in the linked list.
I have a class called product with getName function.
public String getName() {
return this.name;
}
So I was wondering how when calling getName function it will return "Black Pen"
thank.
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If I understand correctly, you have a list of product objects that has a recipient for the name and you want to get the name of the product and its there in the Arraylist. According to this assumption, I created a dummy person
and ArrayList
and named the product getter and printed it out.
If you know the location of the object in ArrayList
, then it's easy to print it just by specifying the object's index in ArrayList
. otherwise, if you know some unique property of a person, you can use a condition if
to filter that property.
I added both cases and included that in the comments section.
class Person {
private String name;
private String location;
public Person(String name,String location) {
this.name = name;
this.location = location;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
public class Test {
public static void main(String[] args) {
List<Person> productList = new ArrayList<>();
productList.add(new Person("Amit","india"));
productList.add(new Person("A", "bangalore"));
// case 1 :- when you know the location of person in LL.
System.out.println(productList.get(0).getName());
// case 2:- when you know some unique peroperty of person and filtering on base of this.
for(Person product : productList){
if(product.getLocation().equalsIgnoreCase("india")){
System.out.println("name of person " + product.getName());
}
}
}
}
Output :-
Amit
name of person Amit
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To call a method of an object stored in LinkedList
, you must get that object from the list. To take the first element of a linked list
products.getFirst().getName();
Get the first element of a linked list
products.getLast().getName();
Note that you can only get items from a linked list sequentially, starting with the first or the last.
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