Java textbook example 3

The Import Statement can use the import statement to introduce classes in the package. Many classes provided by Java are often used in addition to writing the classes in the source file. These classes may be in different packages, java provides more than 130 packages, such as java. the applet contains all java classes that implement java applet. awt contains the image, text, and window GUI class java in the abstract window tool set. awt. image contains the image processing class java in the abstract window tool set. lang contains all the basic language classes java. io contains all input and output classes java.net contains all classes that implement network functions. util contains useful data type classes [html] import java. applet. applet; import java. awt. *; public class xiaochengxu extends Applet {www.2cto.com Button redbutton; public void init () {redbutton = new Button ("I Am a red Button"); redbutton. setBackground (Color. red); redbutton. setForeground (Color. white); add (redbutton);} the protected and private classes cannot be used.