第八周作业
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(intdx,intdy)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 com.wht.dome1;
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));
}
}
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 JavaDemo;
public class Rectangle {
private int length;
private int width;
public Rectangle() {
}
public Rectangle(int length,int width) {
this.length=length;
this.width=width;
}
public void getArea() {
int a=length*width;
System.out.println("面积为"+a);
}
public void getPer() {
int b=2*length+2*width;
System.out.println("周长为"+b);
}
public void showAll() {
System.out.println("长为"+length+"宽为"+width);
getArea();
getPer();
}
public static void main(String[] args) {
Rectangle c=new Rectangle(3, 4);
c.getArea();
c.getPer();
c.showAll();
}
}

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 JavaDemo;
public class Computer {
private char color;
private int cpu;
public Computer() {
super();
// TODO Auto-generated constructor stub
}
public Computer(char color, int cpu) {
super();
this.color = color;
this.cpu = cpu;
}
public void showAll() {
System.out.println("笔记本的颜色为"+color+"笔记本的型号为"+cpu);
}
}
package JavaDemo;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Computer a=new Computer('黄',1002);
a.showAll();
}
}
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
package JavaDemo;
public class Person1 {
private String name;
private double height;
private int weight;
public Person1() {
super();
// TODO Auto-generated constructor stub
}
public void sayHello() {
System.out.println("hello my name is "+this.name);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
}

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 JavaDemo;
public class Vehicle {
private final String brand;
private String color;
private double speed;
public Vehicle(String brand, String color) {
super();
this.brand = brand;
this.color = color;
}
public void run() {
System.out.println("本汽车正在以"+this.speed+"迈的速度行驶");
}
)
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public double getSpeed() {
return speed;
}
public void setSpeed(double speed) {
this.speed = speed;
}
public String getBrand() {
return brand;
}
}
package JavaDemo;
public class VeichleTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Vehicle v1=new Vehicle("benz","black");
v1.setSpeed(60);
v1.run();
}
}
package JavaDemo;
public class VeichleTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Vehicle v1=new Vehicle("benz","black");
v1.setSpeed(60);
v1.run();
}
}


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