This repository demonstrates a tictactoe smart gameplay contract written in Java that run on the NEO blockchain.
The easiest way to interact with this project is in your browser. Visit the neo playground: playground. Open the java web-ide. Load the tictactoe smart-contract from this repo, src/main/java/io/neow3j/examples/contractdevelopment/contracts/TicTacToe.java, into Neo's contract directory src/main/java/io/neow3j/examples/contractdevelopment/contracts. Add the tictactoe deploy file src/main/java/io/neow3j/examples/contractdevelopment/DeployTicTacToe.java. Change className's value in build.gradle to "io.neow3j.examples.contractdevelopment.contracts.TicTacToe"
The following instructions assume that the Web IDE was started successfully (see Setup).
To open a terminal, use the Terminal drop-down menu in the IDE user interface.
Run this in a terminal:
neoxp runIn a new terminal window, list existing wallets:
neoxp wallet list... Alice
NM7Aky765FG8NhhwtxjXRx7jEL1cnw7PBP (Default)
... Bob NV1Q1dTdvzPbThPbSFz7zudTmsmgnCwX6c (Default)
Create your own wallet by running something like this (replace "Colin" w/your name):
neoxp wallet create ColinColin
NcegmgmiTL8wAh18S2KYvWxGJP5ygAwHcG
In the root/workspace directory, run this in your terminal:
./gradlew neow3jCompileThis will compile the smart contract class (specified in build.gradle, and output a NEF file, contract manifest, and debugging information file to the output directory, by default at build/neow3j
The easiest way to deploy the contract is by navigating to the deployment java file and clicking the VsCode run button above the main method.
For the TicTacToe contract, this deployment file is at: src/main/java/io/neow3j/examples/contractdevelopment/DeployTicTacToe.java
If successful, you'll see something like this in your terminal:
The contract was deployed in transaction f062397... Script hash of the deployed contract: f8d63b2f0d... Contract Address: Ngzq4QyGhvnRmZHLuhkWjuvZx8NHDE2yZn
To list your deployed contracts, run:
neoxp contract list... TicTacToe (0xf8d63b2f0db3b3f03bbb1e314425b17a02f045e7)
Troubleshooting: In case of "Insufficient GAS", then you'll need to to transfer GAS to
Alice'swallet (the default deployer). Run:neoxp transfer 100000 GAS genesis AliceIn case of "Failed to connect" or "Connection refused", start the Neo node by running:
neoxp run
For this project, I made a tic-tac-toe smart contract.
The tic-tac-toe board is represented as an array that holds 9 ints[0,0,0,0,0,0,0,0,0]:
The indexes represent the locations:
0, 1, 2
3, 4, 5
6, 7, 8
Player 1's marker is "1". Player 2's marker is "2".
A final game where player 1 wins might be stored as [2,1,2,1,1,2,2,1,2] which looks like:
2, 1, 2
1, 1, 2
2, 1, 2
Here's how to interact with the contracts via the terminal.
#start a game between Alice and Bob
neoxp contract run TicTacToe startGame @Alice @Bob -a Alice
#Make moves
neoxp contract run TicTacToe takeTurn 0 @Bob -a Bob
neoxp contract run TicTacToe takeTurn 1 @Alice -a Alice
neoxp contract run TicTacToe takeTurn 2 @Bob -a Bob
neoxp contract run TicTacToe takeTurn 3 @Alice -a Alice
neoxp contract run TicTacToe takeTurn 4 @Alice -a Alice
neoxp contract run TicTacToe takeTurn 5 @Bob -a Bob
neoxp contract run TicTacToe takeTurn 6 @Bob -a Bob
#Winning move (3 in a the middle column)
neoxp contract run TicTacToe takeTurn 7 @Alice -a Alice
#See the gameboard
neoxp contract run TicTacToe getBoard -r2, 1, 2 1, 1, 2 2, 1, 0
#Check if game is over
neoxp contract run TicTacToe isGameOver -r
#Get Final getWinner
neoxp contract run TicTacToe getWinner -rMost commands use Neo-Express. Run this in the terminal for options:
neoxp --helpCommands:
batch - Execute a series of offline Neo-Express operations checkpoint - Manage neo-express checkpoints contract - Manage smart contracts create - Create new neo-express instance export - Export neo-express protocol, config and wallet files oracle - Manage oracle nodes and requests policy - Manage blockchain policy reset - Reset neo-express instance node run - Run Neo-Express instance node show - Show information stop - Stop Neo-Express instance node transfer - Transfer asset between accounts wallet - Manage neo-express wallets
At least Java 8 is required.
Additionally, many examples will require a Neo network. I recommend using Neo Express for that purpose. It is integrated into the Neo Blockchain Toolkit that is available on the VSCode Extension Marketplace.
All examples are using Gradle as the build tool and provide a Gradle wrapper. So, you don't necessarily need Gradle installed on your machine.
I recommend using Virtual Studio Code (VSCode) for trying these examples. You can then make use of the Neo Blockchain Toolkit which gives you the best developer experience with Neo. Checkout their Quickstart Guide for how to set it up.
With VSCode you should install the Java Extension Pack and the Gradle Extension Pack for Java and Gradle support.
These examples are accompanied by code tours. To make use of them install the VSCode Code Tours extension.
Once you have VSCode setup, clone the whole examples repository and open this directory with VSCode. Now you can build the project with ./gradlew build. Some examples don't depend on a running Neo network, those can be executed immediately, e.g., via the Run buttons above the main methods. All other examples will require a running Neo network. Setting this up with the help of the Neo Blockchain Toolkit is explained in the code tours.
See LICENSE for copyright and license terms.
All repositories and other materials are provided subject to the terms of this IMPORTANT notice and you must familiarize yourself with its terms. The notice contains important information, limitations and restrictions relating to our software, publications, trademarks, third-party resources, and forward-looking statements. By accessing any of our repositories and other materials, you accept and agree to the terms of the notice.