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();

}

 

}

 

posted @ 2023-06-18 21:09  TLWLS  阅读(6)  评论(0编辑  收藏  举报