chapter 4 practice 1

《Thinking in java》chapter 4 practice 1

//:<<thinking in java>> chapter 4 practice 1
//:c4/P1.java
// use default constructor to create a object
class NoteBook{
 NoteBook(){
  System.out.println("Created a NoteBook.");
 }
}
public class P1{
 public static void main(String[] args){
  NoteBook nb1 = new NoteBook();
  System.out.println("OK.");
 }
}