From 3bbabbcc65e4e472294646ecc4aa69bcf99b28ae Mon Sep 17 00:00:00 2001
From: Ishita <95162790+ishita-kundi04@users.noreply.github.com>
Date: Fri, 14 Oct 2022 22:45:15 +0530
Subject: [PATCH] adding some basics of block chain

for beginner understanding, explained with code how block chain can be implemented in java using arrayList
---
 .../bin/ImplimentChain.class                  | Bin 0 -> 1219 bytes
 Block Chain Implimentation/bin/MyInfo.class   | Bin 0 -> 914 bytes
 .../src/ImplimentChain.java                   |  28 ++++++++++++++++
 Block Chain Implimentation/src/MyInfo.java    |  30 ++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 Block Chain Implimentation/bin/ImplimentChain.class
 create mode 100644 Block Chain Implimentation/bin/MyInfo.class
 create mode 100644 Block Chain Implimentation/src/ImplimentChain.java
 create mode 100644 Block Chain Implimentation/src/MyInfo.java

diff --git a/Block Chain Implimentation/bin/ImplimentChain.class b/Block Chain Implimentation/bin/ImplimentChain.class
new file mode 100644
index 0000000000000000000000000000000000000000..82abc29bff4a32cc936024babe994c54dd2d96c6
GIT binary patch
literal 1219
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zB>DsV;7>B%*)3?3e%RTWbI;s+?qh!a`Ti3?4sUhzFbw9Krw!4xY`I<M!q%ZN#83EV
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literal 0
HcmV?d00001

diff --git a/Block Chain Implimentation/bin/MyInfo.class b/Block Chain Implimentation/bin/MyInfo.class
new file mode 100644
index 0000000000000000000000000000000000000000..91b56929602376c0d75f00b840c20e93690732ac
GIT binary patch
literal 914
zcmZuve{0iF6g{s=n>Kx}wRNkm{@C2qB(}>3s0b>Efw~DDh2dYXF>5npB57LKNASD&
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z6cnW6bSg-{(@0ZNRH;HomEN3gpXjbq>{{P(&1x@Dw>k?nia(*8D4h%3xWM+{L~YA(
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Hl;Yqo@xiAt

literal 0
HcmV?d00001

diff --git a/Block Chain Implimentation/src/ImplimentChain.java b/Block Chain Implimentation/src/ImplimentChain.java
new file mode 100644
index 00000000..ea7ac253
--- /dev/null
+++ b/Block Chain Implimentation/src/ImplimentChain.java	
@@ -0,0 +1,28 @@
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class ImplimentChain {
+	/**
+	 Hash = digital signature
+	 Each Block will have :-
+	 	List of transactions
+	 	Previous Hash
+	 	Hash
+	 */
+	
+	ArrayList<MyInfo> blockchain = new ArrayList<>();
+	
+	public static void main(String[] args) {
+		String[] genesisTransactions = {"Ishita sent nini 20 bitcoin","Rajat sent fin 50 bitcoin"};
+		MyInfo genesisInfo = new MyInfo(0, genesisTransactions);
+		
+		String[] block2Transaction = {"A sent 10 bitcoin to B", "B sent 5 bitcoin to C"};
+		MyInfo block2 = new MyInfo(genesisInfo.getBlockHash(), block2Transaction);
+		
+		System.out.println("Hash of genesis Block :");
+		System.out.println(genesisInfo.getBlockHash());
+		System.out.println("Hash of Block 2:");
+		System.out.print(block2.getBlockHash());
+	}
+
+}
diff --git a/Block Chain Implimentation/src/MyInfo.java b/Block Chain Implimentation/src/MyInfo.java
new file mode 100644
index 00000000..958a44f9
--- /dev/null
+++ b/Block Chain Implimentation/src/MyInfo.java	
@@ -0,0 +1,30 @@
+import java.util.Arrays;
+
+public class MyInfo {
+	
+	private int previousHash;
+	private String[] transactions;
+	
+	private int BlockHash;
+	
+	public MyInfo(int previousHash, String[] transactions) {
+		this.previousHash = previousHash;
+		this.transactions = transactions;
+		
+		Object[] contents = {Arrays.hashCode(transactions), previousHash };
+		this.BlockHash = Arrays.hashCode(contents);
+	}
+	
+	public int getPreviousHash() {
+		return previousHash;
+	}
+	
+	public String[] getTransactions() {
+		return transactions;
+	}
+	
+	public int getBlockHash() {
+		return BlockHash;
+	}
+	
+}