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(); } }