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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is a Nonce in Block Chain?
Cryptocurrency like Bitcoin uses the Block chain as a decentralized, distributed, public digital ledger that records all the transactions of the Bitcoin. Block Chain has a unique feature of storing the value of previous block as a hash value in the current block, which makes it impossible to alter any block without changing all the subsequent blocks.The miners create a block and verify it and will be rewarded for using their CPU power to do so. The block which gets more than 50% consensus will be added to the block chain. During the verification of Block, the miners will complete ...
Read MoreDisplay multiple lines of text in a component's tooltip with Java
Let’s first see how we set text in a components tooltip −JLabel label3 = new JLabel("Password", SwingConstants.CENTER); label3.setToolTipText("Enter Password");To display multiple lines of text in a tooltip, use . Here, we have used the HTML tag for new line and that would create multiple lines of text in the tooltip −label3.setToolTipText("" + "This will create multiple lines for the" + "" + "component! Yay!" + "");The following is an example to display multiple lines of text in a component’s tooltip −Examplepackage my; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.Point; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingConstants; import ...
Read MoreWhat are Orphan Blocks?
Block Chain is the most important component of any cryptocurrency network. Cryptocurrency is based on distributed, transparent public ledger where all the transactions ever made on a cryptocurrency are noted in the blocks and added to the block chain. Miners get attractive rewards to verify and create a new block and add it successfully to the Block Chain.Here comes the twist. There will be some blocks which are created, but not accepted by the block chain network. There are called Orphan Blocks. Orphan blocks are verified and valid blocks, but not accepted by the block chain network due to a ...
Read MoreHow to get android notifications when the app was closed?
This example demonstrate about How to get android notifications when the app was closedStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivitypackage app.tutorialspoint.com.notifyme ; import android.content.Intent ; import android.os.Bundle ; import android.support.v7.app.AppCompatActivity ; import android.view.View ; public class MainActivity extends AppCompatActivity { @Override protected void onCreate (Bundle savedInstanceState) { super .onCreate(savedInstanceState) ; setContentView(R.layout. activity_main ) ...
Read MoreMust we implement all the methods in a class that implements an interface in Java?
Yes, it is mandatory to implement all the methods in a class that implements an interface until and unless that class is declared as an abstract class.There are only two choices −Implement every method defined by the interface.Declare the class as an abstract class, as a result, forces you to subclass the class (and implement the missing methods) before you can create any objects.The only case the class do not need to implement all methods in the interface is when any class in its inheritance tree has already provided concrete (i.e. non-abstract) method implementations then the subclass is under no ...
Read MoreHow to move the horizontal slider right-to-left in Java?
At first, let us create a horizontal slider −JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 55);Now, we will set it to move right-to-left using setInverted() −slider.setInverted(true);The following is an example to move the horizontal slider right-to-left −Examplepackage my; import java.awt.Color; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.WindowConstants; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame("Frame with Slider"); JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 55); slider.setInverted(true); slider.setMinorTickSpacing(10); slider.setMajorTickSpacing(25); slider.setPaintTicks(true); ...
Read MoreWhat are Smart Contracts?
Cryptocurrency is entirely dependent on Block Chains to maintain their transactions. A block is like a page of a ledger book where some transactions are written in ink, permanent which cannot be altered. A block typically consists of transactions of bitcoin or any other cryptocurrency and the details of transactions - who has sent, who has received, timestamp and previous blocks information to link it to the Block chain. This information is passed through a hashing algorithm like SHA 256 and creates a 32-bit hash value. This hash value is irreversible.Thus a block is a permanent store of records, which ...
Read MoreHow to create a border with a raised beveled edge in Java?
Use the createRaisedBevelBorder() method to create a border with a raised beveled edge. We will set it on the label component −JLabel label; label = new JLabel("This has a border with a raised bevel edge!"); label.setBorder(BorderFactory.createRaisedBevelBorder());The following is an example to create a border with a raised beveled edge −Examplepackage my; import javax.swing.BorderFactory; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JLabel; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); JLabel label; label = new JLabel("This has a border with a raised bevel edge!"); ...
Read MoreWhat is Ethereum?
Before we talk about Ethereum let us first understand the concept of Decentralized network of Bitcoin which laid the foundation for the following Decentralized networks. Bitcoin digital currency was invented by Satoshi Nakamoto in 2009 as using a decentralized and transparent network.Bitcoin uses Cryptography + Proof of work + Decentralized network architecture together. The algorithm of Bitcoins is written in “Turing Incomplete” language, which understands only a limited set of orders like, who has sent the money, how much and who received it.While Bitcoin aims to remove a centralized authority to create the currency, Ethereum uses the Block Chain to ...
Read MoreHow to hide the track on the slider in Java?
To hide the track on the slider, you need to use the setPaintTrack() method and set it to FALSE −JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 55); slider.setInverted(true); slider.setMinorTickSpacing(10); slider.setMajorTickSpacing(25); slider.setPaintTicks(true); slider.setPaintLabels(true); slider.setPaintTrack(false);The above method setPaintTrack() is by default set to TRUE.The following is an example to hide the track on the slider −Examplepackage my; import java.awt.Color; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.WindowConstants; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame("Frame with Slider"); JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 55); ...
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