adding some basics of block chain

for beginner understanding, explained with code how block chain can be implemented in java using arrayList

Block Chain Implimentation/src/ImplimentChain.java

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+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());
+	}
+
+}

Block Chain Implimentation/src/MyInfo.java

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+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;
+	}
+	
+}