Java第八次作业
1、 定义一个点类Point,包含2个成员变量x、y分别表示x和y坐标,2个构造器Point()和Point(intx0,y0),以及一个movePoint(int dx,int dy)方法实现点的位置移动,创建两个Point对象p1、p2,分别调用movePoint方法后,打印p1和p2的坐标。[必作题]
package aaa; public class Point { private int x; private int y; public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } public Point() { super(); } public Point(int x, int y) { super(); this.x = x; this.y = y; } public void movePoint(int dx,int dy) { int x1=x+dx; int y1=y+dy; System.out.println("这个点从("+x+","+y+")挪到了("+x1+","+y1+")"); } } package aaa; public class Text { public static void main(String[] args) { // TODO Auto-generated method stub Point p1=new Point(2,3); Point p2=new Point(4,5); p1.movePoint(30,40); p2.movePoint(20,30); } }
二、定义一个矩形类Rectangle:(知识点:对象的创建和使用)[必做题]
1.定义三个方法:getArea()求面积、getPer()求周长,showAll()分别在控制台输出长、宽、面积、周长。
2.有2个属性:长length、宽width
3.通过构造方法Rectangle(intwidth,intlength),分别给两个属性赋值
4.创建一个Rectangle对象,并输出相关信息
package aaa; public class Rectangle { private int width; private int length; public Rectangle() { } public Rectangle(int width, int length) { this.length=length; this.width=width; } public int getArea() { return width*length; } public int getPer() { return width*2+length*2; } public void showAll() { this.length=length; this.width=width; System.out.println("这个矩形长为"+length+"宽为"+width+"面积为"+getArea()+"周长为"+getPer()); } } package aaa; public class Text { public static void main(String[] args) { // TODO Auto-generated method stub Rectangle r= new Rectangle(3,4); r.showAll(); } }
三、定义一个笔记本类,该类有颜色(char)和cpu型号(int)两个属性。[必做题]
1.无参和有参的两个构造方法;有参构造方法可以在创建对象的同时为每个属性赋值;
2.输出笔记本信息的方法
3.然后编写一个测试类,测试笔记本类的各个方法。
package aaa; public class Notebook { private char ys; private int xh; public char getYs() { return ys; } public void setYs(char ys) { this.ys = ys; } public int getXh() { return xh; } public void setXh(int xh) { this.xh = xh; } public Notebook() { super(); } public Notebook(char ys, int xh) { super(); this.ys = ys; this.xh = xh; } public void show() { System.out.println("该笔记本颜色为"+ys+"型号为"+xh); } } package aaa; public class Text { public static void main(String[] args) { // TODO Auto-generated method stub Notebook n=new Notebook('蓝',123); n.show(); } }
五、定义两个类,描述如下:[必做题]
1.定义一个人类Person:
(1)定义一个方法sayHello(),可以向对方发出问候语“hello,mynameisXXX”
(2)有三个属性:名字、身高、体重
2.定义一个PersonCreate类:
(1)创建两个对象,分别是zhangsan,33岁,1.73;lishi,44,1.74
(2)分别调用对象的sayHello()方法。
package aaa; public class Person { String name; double height; int weight; int age; public void sayhello() { System.out.println("hello,my name is " + name); System.out.println("my height is " + height + "米"); System.out.println("my weight is " + weight + "斤"); System.out.println("my age is " + age + "岁"); } } package aaa; public class PersonCreate { public static void main(String[] args) { // TODO Auto-generated method stub Person a = new Person(); Person b = new Person(); a.name ="zhangsan"; a.age = 33; a.height = 1.73; a.weight = 120; b.name = "lishi"; b.age = 44; b.height = 1.74; b.weight = 140; a.sayhello(); b.sayhello(); } }
六、定义一个汽车类Vehicle,要求如下:[选做题]
1.属性包括:汽车品牌brand(String类型)、颜色color(String类型)和速度speed(double类型),并且所有属性为私有。
2.至少提供一个有参的构造方法(要求品牌和颜色可以初始化为任意值,但速度的初始值必须为0)。
3.为私有属性提供访问器方法。注意:汽车品牌一旦初始化之后不能修改。
4.定义一个一般方法run(),用打印语句描述汽车奔跑
的功能
5.定义测试类VehicleTest,在其main方法中创建一个品牌为“benz”、颜色为“black”的汽车。
package aaa; public class Vehicle { private String brand; private String color; private double speed; public Vehicle(String brand,String color){ this.brand=brand; this.color=color; } Vehicle(String brand, String color, double speed) { super(); this.brand = brand; this.color = color; this.speed = speed; } public void run(){ System.out.println("这个汽车的品牌为"+this.brand+"这个汽车的颜色为"+this.color+"这个汽车的速度为"+this.speed); } } package aaa; public class VehicleTest { public static void main(String[] args) { Vehicle v=new Vehicle("benz","black"); v.run(); Vehicle v1=new Vehicle("benz","black",13); v1.run(); } }