chapter08_02.java

适合于初学者使用的许多经典的实例

                                          // ---------------构造函数的重载-----------------

class C01_Circle {
	     private double pi=3.1415926;
	     private double radius;
	     private String color;
	     
	     public C01_Circle() {
	     	 System.out.println("Constructor C01_Circle() called !");
	     	 radius=1.0;
	     	 color="GREEN";
	     }
	     
         public C01_Circle(String str,double r) {
             System.out.println("Constructor public C01_Circle() called !");
             color=str;
             radius=r;
         }
         
         public void show() {
         	 System.out.println("radius="+radius+", area="+pi*radius*radius);
         	 System.out.println("Color="+color+"\n");
         }
}

public class Chapter08_02 {
	     public static void main(String[] args) {
             C01_Circle cir=new C01_Circle();
             cir.show();
             
             C01_Circle cir01=new C01_Circle("BUER",3.0);
             cir01.show();
         }
}