Semaphore in java with example
What is a semaphore Semaphore is used to limit access to a resource to a fixed number of threads. With semaphore you can ensure that a code is executed concurrently…
Java 8 interface default methods
Meaning of default method A method in an interface having a body or implementation is called a default method. The concept of default methods was introduced in java 8. Till…
Thread.sleep method in java
Making a thread sleep means pausing its execution for some specified amount of time. Java provides 2 methods in which a thread execution can be paused and this article will…
How to copy file in java
Copying a file means creating a duplicate file at some other location. Copying involves reading the file and writing its contents to a new location. There are many methods to…
How to delete a directory in java
A file and directory in java can be deleted by using delete method on java.io.File object which points to the underlying physical file or directory. delete method will delete a…
Instance variables in java
Instance variables are the variables that are defined at the class level. Class level means they are defined inside the class body but outside of any method or block. Instance…
How to get last modified date of a file in linux
Many times you need to check the time a file or folder was last modified to ensure that you have the latest and required file in place. There are many…
static keyword in java
static keyword static is a reserved word(or keyword) in java. It can be applied before a field(or instance member) method class unnamed block Writing static keyword before any of the…
How to lock a file for writing in java
In a multi-threaded application where multiple threads are accessing a resource at the same time, it becomes necessary to handle concurrent modifications. Suppose a file is being written by a…