摘要： class Lader{ double above,bottom,height; Lader(){} Lader(double a,double b,double h){ above=a; bottom=b; height=h; } public void setAbove(double a) { above=a; } public void setBottom(double b) { bottom=b; } public void setHeight(double h) { height=h; } double computeArea(){ return(above+bottom)*heig 阅读全文

摘要： 例4-2class Circle{double radius;double getArea(){double area=3.14*radius*radius;return area;}}public class Example4_2{public static void main(String args[]){Circle circle;circle=new Circle();circle.radius=163.16;double area=circle.getArea();System.out.printf("半径是%5.3f的圆的面积:\n%5.3f\n",circle 阅读全文

摘要： 例4-1public class ComputerCircleArea{public static void main(String args[]){double radius;double area;radius=163.16;area=3.14*radius*radius;System.out.printf("半径是%5.3f的圆的面积:\n%5.3f\n",radius,area);}} 阅读全文