chapter08_05.java

适合于初学者使用的许多经典的实例

                                    // ------------------------------实例变量与实例方法-----------------------------------

class C05_Circle {
	     private double pi=3.1415926;
	     private double radius;
	     
	     public C05_Circle(double r) {                                       // 有一个参数的构造函数  
	      	 radius=r;
	     }
	     
	     public void show() {
         	 System.out.println("radius="+radius+", area="+pi*radius*radius);
         }
}

public class Chapter08_05 {
         public static void main(String[] args) {
             C05_Circle cir01=new C05_Circle(7.0);
             cir01.show();                            
             
             C05_Circle cir02=new C05_Circle(7.5);
             cir02.show();                            
         }
}