package com.hanqi.test; public class Rect { ; ; public double getWidth() { return width; } public void setWidth(double width) { this.width = width; } public double getHeight() { return height; } public void setHeight(double height) { this.height = he

package zhongqiuzuoye; //自己写的方法 public class Rect { public double width; public double height; Rect(double width,double height) //带有两个参数的构造方法,用于将width和height属性初化; { this.width=width; this.height=height; } Rect() //不带参数的构造方法,将矩形初始化为宽和高都为10. { width=10

class Rectangle { private double len, wid; public Rectangle()//求矩形周长 { len = 0; wid = 0; } public Rectangle(int l, int w)//求矩形面积 { len = l; wid = w; } public double perimeter()//求周长 { return ((len + wid) * 2); } public double area()//求面积 { return (le

22．编写一个类A,该类创建的对象可以调用方法showA输出小写的英文字母表.然后再编写一个A类的子类B,子类B创建的对象不仅可以调用方法showA输出小写的英文字母表,而且可以调用子类新增的方法showB输出大写的英文字母表.最后编写主类C,在主类的main方法 中测试类A与类B. package jicheng; public class A { public void showA() { System.out.println("asdfsdf"); } } package jic

编写一个Animal类,具有属性:种类:具有功能:吃.睡.定义其子类Fish package zhongqiuzuoye; public class Animal { //属性 private String type; public String getType() { return type; } public void setType(String type) { this.type = type; } //功能 public void eat() { } public void sleep

编写Java应用程序.首先定义一个描述银行账户的Account类,包括成员变 量“账号”和“存款余额”,成员方法有“存款”.“取款”和“余额查询”.其次, 编写一个主类,在主类中测试Account类的功能. public class account { private String zhanghao; private double yue; account(String zh) { zhanghao=zh; } account(String zh,double ck) { zhanghao=zh

//编写一个数组类 MyVector,数组内容可以动态扩充,实现构造,析构,赋值操作符重载,插入,删除,获取元素个数,获取数组容量(不可以使用STL等的容器类,不能使用 //不连续的存储空间) #include<iostream> using namespace std; class MyVector { public: MyVector() { size=; val=new int[count]; iterator=val; start=val; end=val; Counts=count;

package jiekou1; public interface ShapePara { //定义常量PI final double PI=3.14; //定义抽象方法 //获得图形面积 double getArea(); //获得图形周长 double getCircumference(); } package jiekou1; public class Circle implements ShapePara { //定义成员变量 public double radius; public d

//矩形父类 package d922A; public class Rect { private double l,w; Rect(double c,double k) { l=c; w=k; } public double s() { return w*l; } } ///立方体类 package d922A; public class Rect1 extends Rect { private double h; Rect1(double c, double k,double g) { su

package zuoye8; public abstract class Shape { private double zhouchang ; private double mianji ; public Shape(double zhouchang, double mianji) { super(); this.zhouchang = zhouchang; this.mianji = mianji; } public Shape() { super(); } //抽象一个周长方法 publi

package shape; public class Shape { //定义成员变量 private double zhouchang; private double mianji; public double getZhouchang() { return zhouchang; } public void setZhouchang(double zhouchang) { this.zhouchang = zhouchang; } public double getMianji() { re

package jvxing; public class Jvxing { //成员变量 private double width; private double chang; public double getWidth() { return width; } public void setWidth(double width) { this.width = width; } public double getChang() { return chang; } public void setC

package com.hanqi.test; //创建接口 public interface ShapePara { //获取面积的方法 double getArea(); //获取周长的方法 double getCircumference(); } package com.hanqi.test; public class Circle implements ShapePara { //定义圆心 public double radius; //定义圆心的横向坐标 private double

1.什么是类对象,实例对象 类对象:类名实例对象:类创建的对象 2.类属性: 就是类对象所拥有的属性,它被所有类对象的实例对象所共有,在内存中只存在一个副本.对于公有的类属性,在类外可以通过类对象和实例对象访问 3. 类的结构 (1) 术语 —— 实例 1. 使用面相对象开发,第 1 步 是设计 类 2. 使用 类名() 创建对象,创建对象 的动作有两步: 3. 在内存中为对象 分配空间 2. 调用初始化方法 `__init__` 为 对象初始化 3. 对象创建后,内存 中就有了一个对象的 实实

package com.hanqi.test; public class Car { //构造一个汽车的属性 private String name; //创建getter和setter方法 public String getName() { return name; } public void setName(String name) { this.name = name; } public void drive() { } } package com.hanqi.test; public c

//接口 ShapePara package d922B; public interface ShapePara { int getArea(); int getCircumference(); } //圆类 package d922B; public class Circle implements ShapePara { public double radius; private double x; protected double y; Circle(double r) { radius=r

///Animal类 package d922A; public class Animal { private String kind; public String getKind() { System.out.println(kind); return kind; } public void setKind(String kind) { this.kind = kind; } public void eat() { System.out.println("I can eat.");

Account package com.hanqi.test; public class Account { private String zhanghao;private double yve; Account (String z,double c) { zhanghao=z; yve+=c; } Account (String z) { zhanghao=z; } void cunkuan(double c) { yve+=c; System.out.println("存款:"+c

/* * 汽车实体类 * 类里面有属性和方法 */public class Car {    String  brand;   //汽车品牌    String modelNumber; //汽车型号    String displacement; //汽车排量    String speed; //汽车速度    String kilometre;//汽车行驶公里    //无参构造函数    public Car() {            }    //设置和取得属性    public

package zhongqiuzuoye; public class Car { String brand; public void drive() {} } package zhongqiuzuoye; public class Aodi extends Car{ public double price; public String model; public double speed; public Aodi(double price,String model,double speed)