Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!
James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. Java was originally designed for interactive television, but it was too advanced for the digital cable television industry at the time. The language was initially called Oak after an oak tree that stood outside Gosling's office. Later the project went by the name Green and was finally renamed Java, from Java coffee. Gosling designed Java with a C/C++ style syntax that system and application programmers would find familiar.
One of the main issues C and C++ like languages are facing is output of program is executable code. This executable code is fully depends on platform on which program is getting compiled. And we have to have different executables for different platforms. Hence these languages are not great for portability, so these are not much useful in internet world, where different platforms are connected to same web world.
Variables are the nouns of a programming language: they are the entities (values, data) that act or are acted upon. All variables in the Java language must have a data type. A variable's type determines the values that the variable can have and the operations that can be performed on it. For example, the declaration int count declares that count is an integer (int).
Java StringBuffer class is used to create mutable string. The StringBuffer class in java is same as String class except it is mutable i.e. it can be changed. Java StringBuilder class is used to create mutable string. The Java StringBuilder class is same as StringBuffer class except that it is non-synchronized. It is available since JDK 1.5.
Multi-threading is a conceptual programming concept where a program is divided into two or more subprograms, which can be implemented at the same time in parallel. A multi-threaded program contains two or more parts that can run concurrently. Here we will learn about- Processor-Based and Thread-Based multitasking; multitasking thread requires less overhead than multitasking processor; Benefits of Multi-threading.
In the Java programming language, every thread has a priority. By default, a thread inherits the priority of its parent thread. You can increase or decrease the priority of any thread with the setPriority method. You can set the priority to any value between MIN_PRIORITY (defined as 1 in the Thread class) and MAX_PRIORITY (defined as 10). NORM_PRIORITY is defined as 5.