qq_45724328的博客

1.对象的赋值与比较创建圆柱 体类Cylinder，并对该类创建的对象进行赋值运算package practice;class Cylinder{private static double pi = 3.14;private double radius;private int height;public Cylinder(double r,int h) {radius =r;height = h;}public void setCylinder(double r,int h ) {r

私有成员例题7.1在圆柱体Cylinder中，创建类的私有成员，使之在该类的外部无法访问该成员。package practice;class Cylinder{private double radius;private int height;private double pi = 3.14;double area() {return piradiusradius;}double volume() {return area() * height;}}public class aa

以变量为参数的调用方法用圆柱体类Cylinder 为例来介绍用变量调用方法package practice;class Cylinder1{double radius;int height;double pi;void setCylinder(double r,int h,double p) {pi =p;radius = r;height = h;}double area() {return piradiusradius;}double volume() {return a

在圆柱体类Cylinder为例来介绍在类的内部调用自己的方法package practice;class Cylinder1{double radius;int height;double pi;void setCylinder(double r,int h,double p) {pi =p;radius = r;height = h;}double area() {return piradiusradius;}double volume() {return area()*he

java中USB接口程序设计1.定义USB接口package java;//定义一个 名称为USB的接口public interface USB {void turnOn(); //启动void turnOff(); //关闭}2.编写鼠标、键盘和麦克风类，作为USB接口的实现类，分别对turnOn（）和turnOff进行实现（1）鼠标类的实现代码package java;//鼠标public class Mouse implements USB {public void