Differences between HashMap and HashTable in Java

• 
• 

PrevNext

HashMap and Hashtable store key/value pairs in a hash table. When using a Hashtable or HashMap, we specify an object that is used as a key, and the value that you want linked to that key. The key is then hashed, and the resulting hash code is used...

Continue reading

Comparator Interface in Java with Examples

• 
• 

PrevNext

Comparator interface is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of two different classes. Following function compare obj1 with obj2Syntax: public int compare(Object obj1, Object obj2):Suppose we have an array/arraylist of our own class type, containing fields like rollno,...

Continue reading

Scanner Class in Java

• 
• 

PrevNext

Scanner is a class in java.util package used for obtaining the input of the primitive types like int, double, etc. and strings. It is the easiest way to read input in a Java program, though not very efficient if you want an input method for scenarios where time...

Continue reading

Start a Java app without installing it

• 
• 

PrevNext

This article describes how you can use JShell to download and execute a Java application. It will eliminate the need for the installation of the application.Do not install, just run!The first obstacle that you have to overcome to make people use your app is the installation.You want people...

Continue reading

Java String to String Array Conversion Examples

• 
• 

PrevNext

A quick and practical guide on how to convert String to String Array in different ways in java.1. OverviewIn this article, you’ll learn how to convert String to String Array in java with example programs.2.  Using the split() methodString api is added with split() method which takes the...

Continue reading

Java Program To Get Union Of Two Arrays

• 
• 

PrevNext

A quick and programming guide to how to get the union of two unsorted arrays in java with example programs.1. OverviewIn this article, you’ll learn how to get the union of two arrays in java. A union set is all the values of two sets or from all...

Continue reading

Locking for multiple nodes the easy way: GCS

• 
• 

PrevNext

It happens to all of us. We develop stateless applications that can scale horizontally without any effort.However sometimes cases arise where you need to achieve some type of coordination.You can go really advanced on this one. For example you can use a framework like Akka and it’s cluster...

Continue reading

Java Program to Calculate Average Using Arrays

• 
• 

PrevNext

1. OverviewIn this article, you’ll learn how to calculate the average of numbers using arrays. You should know the basic concepts of a java programming language such as Arrays and forEach loops.We’ll see the two programs on this. The first one is to iterate the arrays using for each...

Continue reading

Lifecycle and States of a Thread in Java

• 
• 

PrevNext

A thread in Java at any point of time exists in any one of the following states. A thread lies only in one of the shown states at any instant:1. New2. Runnable3. Blocked4. Waiting5. Timed Waiting6. TerminatedThe diagram shown below represent various states of a thread at any...

Continue reading