The Java class libraries

The built-in methods such as: println() and print() are members of the System class, that is a class predefined through Java which is automatically involved in your programs. Within the larger view, the Java environment relies on various built-in class libraries which hold several built-in methods which give support for such things as Input or output, string handling, networking and graphics. A standard classes also give support for windowed output. Therefore, Java as a totality is a combination of the Java language itself, plus its standard classes. As  you  will  look,  the  class  libraries  provides  much  of  the functionality that comes with Java. Indeed, types of becoming a Java programmer is learning to use the standard Java classes.