//Date Date = new Date()； Set the current date

calendar . add(calendar . settime(date)； /calendar object

Calendar; now

calendar calendar = calendar . getinstance()； //.Month and Day,1); //Days plus one

Java is an object-oriented programming language, which can write cross-platform applications. Java？ Technology has excellent universality, high efficiency, platform portability and security, and is widely used in PC, data center, game console, scientific supercomputer, mobile phone and Internet, and has the largest professional community of developers in the world.

Different from traditional programs, Sun took Java as an open technology when it was introduced. Tens of thousands of Java development companies around the world are required to design Java software that must be compatible with each other. "Java language depends on the strength of the group, not the strength of the company" is one of Sun's slogans, and has been recognized by the majority of software developers. This is completely different from the elite-oriented and closed mode advocated by Microsoft.

Sun's explanation of Java programming language is that Java programming language is a simple, object-oriented, distributed, explanatory, robust, secure, system-independent, portable, high-performance, multi-threaded and dynamic language.

Java platform is a platform based on Java language. Such a platform is very popular at present, so Microsoft has launched a competitive one. NET platform and a C# language imitating Java.