Java concurrency example-Synchronize resources using Semaphore
Semaphore is used to synchronize threads. Semaphores are often used to restrict the number of threads than can access some […]
Core Java
Concurrency – Synchronize resources using ReentrantLock in java (example)
Given shared resources in java. Synchronize shares resources using Lock interface. We will use ReentrantLock to protect share resources. A
Concurrency – Producer & Consumer in java (Wait notify example)
Given multi-threading application in java. Create Producer & Consumer threads. Producer thread will produces the data. Consumer thread will consumes
Find number of consecutive 1’s in a binary number in java (example)
Given a decimal number in java (base 10) Find out number of consecutive 1’s in a binary number. 1. Examples
Get all fields/data members of class in java (example)
Given a class in java containing public,private & protected fields. Get/list/print all fields of class using class Class. We will use
Print/list all methods/functions of class in java (example)
Given a class in java containing public,private & protected methods. We will declare a Person class containing: Public methods. Private
Print/list public/protected/private constructors of class in java (example)
Given a class in java containing public,private & protected contructors. Get/list/print all constructors (prive,protected & public) of a class using
Print/list public methods/functions of class in java (example)
Given a class containing public methods in java. Get/Print/list public methods/functions of class in java (example) using class Class.
find out the class name of an object at runtime (java/example)
Given an instance of class in java. We would like to find out the class name of an object. We
Find type of objects at runtime using instanceof operator (java/ example)
Given the parent child class hierarchy in java. We would like to compare the instance of classes at run-time. We
Create object/instance of class by name using Class.forName in java (examples)
Given an application in java. We would like to create the instance of classes by specifying class name. Instances of
Display name,id, GMT offset of all time zones in JVM (java/example)
We would like to list all available time zones supported by JDK. TimeZone represents a time zone offset, and also
Get & Set default timezone of java virtual machine (JVM) – example
We would like to get/set the default timezone in java. TimeZone represents a time zone offset, and also figures out
Convert local file path to URL & URI in java (example)
Given a local file present on our file system. We would like to convert path of a file to URL
Create or Write or dump java properties to file in java (example)
Given a key value pairs of properties in java.Create or write or dump properties to property file using Properties class (example)
Sort user defined objects/POJO in array (java/example/Comparator interface)
Given an array of user defined objects/POJO in java. We would like to sort user defined objects on certain properties/data
Copy properties from one bean into another bean/object (java/ example)
Given a source bean or object in java. We would like to copy properties from source bean into destination bean
Display currency code/ symbol from Locale in java (example)
Given Locale for given language & country code in java. We would like to display currency code & symbol for
Internationalize/ Localize java application using locales/ ResourceBundle (example)
Given a java application supporting different languages like French,German, Korean, Japanese, English etc. We will localize strings for each language
CopyOnWriteArrayList concurrent collection in java (example)
CopyOnWriteArrayList is thread-safe variant of ArrayList. New copy of underlying array is created when any add, set (or modification) operations
Read contents from console or command line (Scanner/ Java/ Example)
Scanner class is a text parser, which is used to parse primitives & strings using regular expression. Scanner split the
Java Scanner example – read & write contents to/ from file (example)
Scanner is text parser which used to parse primitives & strings using regular expression. Scanner split the input into token
Inter thread communication in java (Example/ PipedInputStream /PipedOutputStream)
Inter thread communication is very common phenomenon. There are many ways to achieve inter thread communication. In current post, we
Check read,write,execute permission & hidden attribute of file in java
Given a file in java, check read, write & execute permissions of a file. We would like to check whether
Create new file & folder (directory) in java (example)
Create new file & directory/folder using File class in java (with example). We will create new directory & file using mkdir & createNewFile respectively
List system drive & their total, free, used space in java (example)
List all system drives in java. We will find out the free (available) , used and total space of each
Unzip or decompress files in java using ZipInputStream & ZipEntry (example)
Given a zipped or compressed file in java. Write a program to unzip or decompress the contents of zip file
Generate UUID or GUID from String in java (with example)
Given an string representing unique identifier. We would like to convert string to corresponding universal unique identifier (UUID) or Globally
Generate unique identifier or UUID or GUID in java (with example)
Universal unique identifier (UUID) or Globally unique identifier (GUID) is unique identifier (or Id). GUID represents the unique id(s). Typically
Generate/create random GUID or UUID in java (JUG library/example)
Generate guid or uuid using RandomBasedGenerator class of Java UUID Generator (JUG) library. In current post, we will generate random uuid