Variables are used to store values that are used in your Java program. A Java variable is a name to a memory location that contains the value assigned to that variable. In this post we’ll see how to declare and initialize a variable in Java, types of variables in Java…
A package in Java is used to group a set of related classes and interfaces. In a big Java application containing hundreds or thousands of individual classes, grouping related classes and interfaces into packages helps to keep things organized. Package structure in Java Packages follow the same structure as directories…
java.util.concurrent.atomic package in Java has classes that support lock free atomic operations. That means using classes contained in this package atomicity of operations is guaranteed for integer, long, boolean values along with object references and arrays with out using explicit synchronization or locks. In this post we’ll discuss one of…
This post shows how you can write a program in Java to print numbers in sequence using three threads. If there are three threads T1, T2, T3 then numbers should be printed alternatively by these threads in the following manner- T1- 1 T2- 2 T3- 3 T1- 4 T2- 5…
In the post Lambda expression in Java we have already seen how Lambda expression provides an instance of functional interface and implements the abstract method of the functional interface. Though sometimes, a lambda expression is used just to call an existing method. In those cases you can refer to the…
In this post we’ll see exception handling with lambda expressions in Java. A lambda expression can throw an exception but that should be compatible with the exceptions specified in the throws clauses of the abstract method of the functional interface. If a lambda expression body throws a checked exception, the…
If you are asked what is deadlock in Java it is almost always accompanied by the question how to create a deadlock in Java. Deadlock in multi-threading is a scenario where two or more threads are waiting for each other to release the resources to make any further progress and…
In this post we’ll see Java program for producer-consumer problem using threads. Producer consumer problem Producer consumer is a classic concurrency problem where synchronization and inter thread communication is required for proper execution. In producer-consumer problem there are two processes Producer and Consumer sharing a common bounded buffer known as…
In this post we’ll see how to print odd and even numbers using two threads in Java. This is an important Java multithreading interview question asked quite frequently. Since two threads are used to alternatively print odd and even numbers so this program also shows how to synchronize threads and…
In this post we’ll see what is the scope of a variable with in a lambda expression in Java. This topic is important as it touches one of the concept that’s added in Java 8; Effectively final in Java. Java lambda expression variable scope Lambda expression in Java doesn’t have…