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(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。
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();

}

 

}

 

 

posted @ 2023-05-23 18:28  露露0817  阅读(27)  评论(0)    收藏  举报