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+---
+title: Basic blockchain implementation
+---
+
+# Basic blockchain implementation using ArrayList of Java
+
+> This's a very basic implementation to get knowledge about blockchain.
+
+## Quick explanation:
+
+Blockchain is a list of blocks with "every block contain verified content of the previous block".
+Then we use collision-free attribute of the cryptographic hash function to verify "the content of the previous block".
+This example will use SHA256 hash function, and use built-in ArrayList type of Java.
+
+## Basic struture:
+
+A block include at least header and data.
+A header contain the verified information of the previous block, or the bash code in this case.
+The very first block is called GENESIS block, with the bash code is the its code.
+
+> We can see blockhain is data struture base on another struture.
+
+## Note:
+ - Since we're using Java, for quickly, the example will use public attribute instead of getter and setter methods.
+ - Data in blockchain could be changed, but it will take a greate cost will the big data.
+
+## Hash library
+We's use the built-in library
+
+```
+import java.security.*;
+public class Sha
+{
+  public static String hash256(String data) //throws NoSuchAlgorithmException 
+  {
+    try
+    {
+      MessageDigest md = MessageDigest.getInstance("SHA-256");
+      md.update(data.getBytes());
+      return bytesToHex(md.digest());
+    }
+    catch(Exception e)
+    {
+      System.out.println(e.toString());
+    }
+    return "ERROR";
+  }
+  public static String bytesToHex(byte[] bytes) 
+  {
+    StringBuffer result = new StringBuffer();
+    for (byte byt : bytes) result.append(Integer.toString((byt & 0xff) + 0x100, 16).substring(1));
+    return result.toString();
+  }
+}
+```
+
+## Create Block
+
+> Every block with contain a header is hash code of the previous block.
+    
+```
+public class Block
+{
+  //Header
+  public String previousHash;
+  
+  //Data
+  public String data;
+  public Block(String _data, String _previousHash)
+  {
+    this.data = _data;
+    this.previousHash = _previousHash;
+  }
+  public String getHash()
+  {
+    return Sha.hash256(this.previousHash + this.data);
+  }
+  public String toString()
+  {
+    return String.format(" dataValue:\t %s\n previousHash:\t %s\n currrentHash:\t %s\n", this.data, this.previousHash, this.getHash());
+  }
+}
+
+```
+    
+## Create Blockchain
+
+```
+import java.util.*;
+public class Blockchain
+{
+  public List<Block> blocks;
+  public void add(String _data)
+  {
+    Block previousBlock = this.blocks.get(this.blocks.size()-1);
+    this.blocks.add(new Block(_data, previousBlock.getHash()));
+  }
+  public Blockchain()
+  {
+    this.blocks = new ArrayList<Block>();
+    this.blocks.add(new Block("GENESIS", Sha.hash256("GENESIS")));
+  }
+}
+```
+
+## Using
+    
+```
+import java.util.*;
+public class BlockchainDemo
+{
+  public static void main(String args[])
+  {
+  
+    //Generate datas
+  
+    List<String> datas = new ArrayList<String>();
+    for(int i=0; i<=10; i++)
+    {
+      datas.add(Integer.toString(i));
+    }
+  
+    //Add blocks in to blockchain with the created datas
+  
+    Blockchain blockchain = new Blockchain();
+  
+    datas.forEach(_data -> blockchain.add(_data));
+  
+    blockchain.blocks.forEach(_block -> System.out.println(_block.toString()));
+  }
+}
+```
+
+## Verify the blockchain
+
+This function will verify if our Blockchain is "trusted", that meant not any block updated
+
+
+```
+public static boolean verify(Blockchain _blockchain)
+{
+  Blockchain.Block previousBlock = _blockchain.blocks.get(0);
+  boolean res = true;
+  for(int i = 1; i < _blockchain.blocks.size(); i++)
+  {
+    Blockchain.Block currentBlock = _blockchain.blocks.get(i);
+    if ( !previousBlock.getHash().equals(currentBlock.previousHash) )
+    {
+      System.out.println("\t\tBROKEN");
+      res = false;
+    }
+  
+    System.out.println(currentBlock.toString());
+  
+    previousBlock = _blockchain.blocks.get(i);
+  }
+  return res;
+}
+
+```