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Programming Articles
Page 202 of 2544
How to Add A Color Picker In Bokeh?
Bokeh is one of the most underrated Python visualization libraries and can be used for various applications, including data analysis, scientific visualization, interactive dashboards, etc. In this blog, we will learn how to add a colorpicker widget in Bokeh. What’s A Color Picker? Color picker is one of the many widgets present in Bokeh. It helps the user to specify an RGB color value. Widgets add interactions to the graphs, which can then help users to update plots or drive new computations without diving into code. Besides the color picker, Bokeh has many interesting widgets like buttons, checkbox groups, ...
Read MoreC program to implement CHECKSUM
What is CHECKSUM? In computing, a checksum is a small-sized data created from a larger data set using an algorithm, with the intention that any changes made to the larger data set will result in a different checksum. Checksums are commonly used to verify the integrity of data that has been transmitted or stored, as errors or modifications in the data can cause the checksum to change. They can also be used to verify the authenticity of the data, as the checksum is often generated using a secret key known only to the sender and receiver. Why we use CHECKSUM? ...
Read MoreCan we call the wait() method without acquiring the lock in Java?
No, we cannot call the wait() method without acquiring the lock. In Java, once the lock has been acquired then we need to call wait() method (with timeout or without timeout) on that object. If we are trying to call the wait() method without acquiring a lock, it can throw java.lang.IllegalMonitorStateException. Example public class ThreadStateTest extends Thread { public void run() { try { wait(1000); } catch(InterruptedException ie) { ie.printStackTrace(); ...
Read MoreImportance of yield() method in Java?
A yield() method is a static method of Thread class and it can stop the currently executing thread and will give a chance to other waiting threads of the same priority. If in case there are no waiting threads or if all the waiting threads have low priority then the same thread will continue its execution. The advantage of yield() method is to get a chance to execute other waiting threads so if our current thread takes more time to execute and allocate processor to other threads. Syntax public static void yield() Example class MyThread extends Thread { public void run() { ...
Read MoreHow to instantiate a static inner class with reflection in Java?
A static inner class can be instantiated without the need for an instance of the outer class. In general, an Inner class is a part of nested class, called Non-static nested classes in Java. The types of inner classes are member inner class, anonymous inner class, and local inner class. We can instantiate a static inner class with reflection using InnerClass.class.newInstance(). If we need an instance of the outer class to instantiate a non-static inner class, we can specify it before a new operator. Example import java.lang.reflect.*; public class InnerclassWithReflectionTest { public static void main(String args[]) { ...
Read MoreImportance of HashSet in Java
The HashSet use Hashing to manipulate data. Let us see an example − Example import java.util.*; public class Demo{ private final String f_str, l_str; public Demo(String f_str, String l_str){ this.f_str = f_str; this.l_str = l_str; } public boolean equals(Object o){ if (o instanceof Demo) return true; Demo n = (Demo)o; return n.f_str.equals(f_str) && n.l_str.equals(l_str); } public static void main(String[] args){ ...
Read MoreHow can we implement a custom iterable in Java?
An Iterable interface is defined in java.lang package and introduced with Java 5 version. An object that implements this interface allows it to be the target of the "for-each" statement. This for-each loop is used for iterating over arrays and collections. An Iterable interface can also be implemented to create custom behavior. Syntax public interface Iterable Example import static java.lang.String.format; import java.util.*; // Person class class Person { private String firstName, lastName; private int age; public Person(){ } public Person(String firstName, String lastName, int age) { this.firstName = firstName; ...
Read MoreCan I import same package twice? Will JVM load the package twice at runtime?
In Java classes and interfaces related to each other are grouped under a package. Package is nothing but a directory storing classes and interfaces of a particular concept. For example, all the classes and interfaces related to input and output operations are stored in java.io package. Creating a Package You can group required classes and interfaces under one package just by declaring the package at the top of the Class/Interface (file) using the keyword package as − Example public class Sample{ public void demo(){ System.out.println("This is a method of the sample class"); } ...
Read MoreHow many ways to make an object eligible for GC in Java?
The process of destroying unreferenced objects is called a Garbage Collection(GC). Once an object is unreferenced it is considered as an unused object, hence JVM automatically destroys that object. There are various ways to make an object eligible for GC. By nullifying a reference to an object We can set all the available object references to "null" once the purpose of creating an object is served. Example public class GCTest1 { public static void main(String [] args){ String str = "Welcome to TutorialsPoint"; // String object referenced by variable str and it is not eligible for GC yet. ...
Read MoreCan we declare an interface with in another interface in java?
An interface in Java is a specification of method prototypes. Whenever you need to guide the programmer or, make a contract specifying how the methods and fields of a type should be you can define an interface. To create an object of this type you need to implement this interface, provide body for all the abstract methods of the interface and obtain the object of the implementing class. Nested Interfaces Java allows declaring interfaces within another interface, these are known as nested interfaces. While implementing you need to refer to the nested interface as outerInterface.nestedInterface. Example In the following Java example, we have an interface with ...
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