Core java

It is very easy to check if file exists or not in your file system. You can use java.io.File’s exists() method to check if file exists or not. Java program : package org.arpit.java2blog; import java.io.File; public class FileExistsMain { /* * @author Arpit Mandliya */ public static void main(String[] args) { System.out.println("-----------------"); // Read the […]

In this post, we will see how to get size of file in java. We can directly use java.io.File ‘s length method to get its size in bytes. We can convert it to KB and MB accordingly. package org.arpit.java2blog; import java.io.File; public class GetSizeOfFileMain { public static void main(String[] args) { // Read the file […]

In this post, we will see how to get extension of file in java. As java.io.File does not provide any direct method for getting extension of file. This is used when you want to process file differently on the basis of its extension. I have worked on a project where I required this utility method. […]

In this post, we will see how to convert String to Date object in java. It is used when we have formatted String and need to convert it to Date object.You may also check how to convert Date to String Java program: package org.arpit.java2blog; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class StringToDateExample { public static void […]

In this post, we will see how to convert date to string in java. It is more of utility which is mostly used while displaying dates in different string formats while generating any pdf or excel reports.You may also check how to convert string to date Java program: package org.arpit.java2blog; import java.util.Date; import java.text.SimpleDateFormat; import […]

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In this post, we will see how to find Greatest common divisor(GCD) and Least Common Multiple(LCM) in java. GCD is calculated using Euclidean algorithm and LCM is calculated using reduction by GCD Eucid algo for calculating GCD is: Lets say , there are two numbers , a and b so GCD of two numbers = […]

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BlockingQueue is introduced in java with concurrent package with ConcurrentHashMap. It is thread safe queue to put and take elements from it. BlockingQueue is special type of queue which is used when one thread produces object and another thread consumes it. Producer thread will keep inserting objects to queue until it reaches upper limit. Once […]