Core java Archive
In this post ,we will try to understand hashcode() and equals() method in java. Java HashMap: HashMap in java How HashMap works in java hash and indexfor method in HashMap hashcode and equals method in …
In this post, we will learn java set to array conversion. There are many ways to convert set to an array. 1. Using Java 8’s Stream If you are using Java 8, I would recommend …
In this post, we will see how to convert Java Collection to List. There are many ways to do it, we will see two ways here. Using ArrayList constructor Above ArrayList‘s constructor creates a …
Shuffle method is to permute passed list with default or specified randomness. Syntax Example : Let’s see both the function with the help of example. When you run above program, you will get below …
In this post, we will see LRU cache implementation in java. Problem Design a Least recently used cache implementation in java. It should have below properties. bounded size: It should have bounded size to take care …
In this tutorial, we are going to see about JHipster. JHipster is a powerful development tool to generate, create and deploy spring boot and angular js or react js application faster. It will create an …
In this tutorial, we will see how to count trailing zeros in factorial of a number in java. Problem Count number of zeros in factorial of number in java. For example: Factorial of 6 is …
In this tutorial, we will see how to install Jenkins on Mac OS X. Step 1:Open browser and enter URL https://jenkins.io/download Step 2:Scroll down the page until you see the Mac OS X section then …
In this tutorial, we will see the most frequent java exception i.e. NullPointerException. It is one of the Runtime Exception. Raise your hand if you ever got NullPointerException while working on java code. I am …
In this tutorial, we will see Find Longest Substring Without Repeating Characters in java. Problem We need to find Longest Substring Without Repeating Characters Solution Brute force solution Find all the substring and check the …
In this post, we will see how to create regex alphanumeric which will create only alphanumeric characters. There are times when you need to validate user’s input. It should contain only characters from a-z, A-Z …