How to create a smart contract

Creating a smart contract. Reading and writing a list with built-in data types

In order to create a smart contract with the list support, it’s necessary to add the following line of code at the beginning of the smart contract:

import java.util.ArrayList;

Declare a variable in class

private final ArrayList<String> list;

Create a variable in constructor

list = new ArrayList<>();

Writing a list

In order to write a list, the standard methods are used for adding the element to an array.

    public void addRange(){
        for(int i = 0; i < 10000; i++) {
            list.add(i + "00000");
        }
    }

Reading an array

Method which returns the number of lines of an array list

   public int count(){

        return list.size();
    }

Accessing array elements through the index

   public String getAt(int i){

        return list.get(i);
    }

The Result

import java.util.ArrayList;

public class Contract extends SmartContract {

    private final ArrayList<String> list;

    public Contract() {
        list = new ArrayList<>();
    }

    public String hello() {
        return "hello";
    }

    public void addRange(){
        for(int i = 0; i < 10000; i++) {
            list.add("I'm a - " + String.valueOf(i));
        }
    }

    public int count(){
        return list.size();
    }

    public String getAt(int i){
        return list.get(i);
    }
}