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Java blockchain (#7694)

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* Adding source code for the article tracked under BAEL-3232.

* Incorporated the review comments on the article.
This commit is contained in:
Kumar Chandrakant 2019-09-04 19:07:13 +05:30 committed by Grzegorz Piwowarek
parent 73743acb30
commit 8c11eeb20e
3 changed files with 7 additions and 7 deletions
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5
java-blockchain/src/main/java/com/baeldung/blockchain/Block.java
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@ -3,7 +3,6 @@ package com.baeldung.blockchain;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
@ -17,10 +16,10 @@ public class Block {
private long timeStamp;
private int nonce;
public Block(String data, String previousHash) {
public Block(String data, String previousHash, long timeStamp) {
this.data = data;
this.previousHash = previousHash;
this.timeStamp = new Date().getTime();
this.timeStamp = timeStamp;
this.hash = calculateBlockHash();
}

7
java-blockchain/src/test/java/com/baeldung/blockchain/BlockchainUnitTest.java
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@ -3,6 +3,7 @@ package com.baeldung.blockchain;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.junit.AfterClass;
@ -17,10 +18,10 @@ public class BlockchainUnitTest {
@BeforeClass
public static void setUp() {
Block genesisBlock = new Block("The is the Genesis Block.", "0");
Block genesisBlock = new Block("The is the Genesis Block.", "0", new Date().getTime());
genesisBlock.mineBlock(prefix);
blockchain.add(genesisBlock);
Block firstBlock = new Block("The is the First Block.", genesisBlock.getHash());
Block firstBlock = new Block("The is the First Block.", genesisBlock.getHash(), new Date().getTime());
firstBlock.mineBlock(prefix);
blockchain.add(firstBlock);
}
@ -28,7 +29,7 @@ public class BlockchainUnitTest {
@Test
public void givenBlockchain_whenNewBlockAdded_thenSuccess() {
Block newBlock = new Block("The is a New Block.", blockchain.get(blockchain.size() - 1)
.getHash());
.getHash(), new Date().getTime());
newBlock.mineBlock(prefix);
assertTrue(newBlock.getHash()
.substring(0, prefix)

2
pom.xml
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@ -579,7 +579,7 @@
<module>spring-boot-nashorn</module>
<module>java-blockchain</module>
<!-- <module>Twitter4J</module> --> <!-- Builds locally, but fails in Jenkins, Failed to parse POMs -->
</modules>
</profile>