第八次作业
package wang; public class Point { int x; int y; public Point(int x0, int y0) { super(); this.x = x0; this.y = y0; } public Point() { super(); } public String movePoint(int dx, int dy) { x = dx + x; y = dy + y; return ("x为" + x + "y为" + y); } public static void main(String[] args) { Point p1 = new Point(2, 5); System.out.println(p1.movePoint(5, 5)); Point p2 = new Point(4, 7); System.out.println(p2.movePoint(3, 7)); } }

2.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 wang;
public class Rectangle { private int length; private int width; public Rectangle(int length, int width) { super(); this.length = length; this.width = width; } public int getArea(){ int Area=length*width; return Area; } public int getper() { int Per=(length+width)*2; return Per; } public void ShowAll() { } System.out.println("长"+length+"宽"+width+"面积"+getArea()+"周长"+getPer()); } }

3.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 wenxuo; public class demko1 { public static void main(String[] args) { // TODO Auto-generated method stub Computer c1 = new Computer(); c1.showComputer(); Computer c2 = new Computer('紫', 25); c2.showComputer(); } } class Computer { private char color; private int cpuNum; public Computer() { } public Computer(char color, int cpuNum) { this.color = color; this.cpuNum = cpuNum; } public char getColor() { return color; } public void setColor(char color) { this.color = color; } public int getCpuNum() { return cpuNum; } public void setCpuNum(int cpuNum) { this.cpuNum = cpuNum; } public void showComputer() { System.out.println("笔记本的颜色:" + getColor()); System.out.println("笔记本的CPU型号:" + getCpuNum()); } }

5.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 wang; 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 wang; 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(); } }

6.、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
(3)通过构造方法,分别给三个属性赋值
2.定义一个Constructor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 wang; public class Constructor { String name; double height; int weight; int age; public Constructor (String name, double height, int weight,int age) { super(); this.name = name; this.height = height; this.weight = weight; this.age=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 + "千克"); System.out.println("my age is " + age + "岁"); } } package wang; public class sayHello { public static void main(String[] args) { // TODO Auto-generated method stub Constructor a=new Constructor ("zhangsan",1.73,55,33); Constructor b=new Constructor ("lishi",1.74,54,44); a.sayhello(); b.sayhello(); } }

7..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 wang; 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 wang; 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(); } }

浙公网安备 33010602011771号