Java第八次作业

一、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]

 

 1 package wen;
 2 
 3  
 4 
 5 public class Point {
 6 
 7  
 8 
 9 int x;
10 
11     int y;
12 
13  
14 
15     public Point(int x0, int y0) {
16 
17         super();
18 
19         this.x = x0;
20 
21         this.y = y0;
22 
23     }
24 
25  
26 
27     public Point() {
28 
29         super();
30 
31     }
32 
33  
34 
35     public String movePoint(int dx, int dy) {
36 
37         x = dx + x;
38 
39         y = dy + y;
40 
41         return ("x为" + x + "y为" + y);
42 
43     }
44 
45  
46 
47     public static void main(String[] args) {
48 
49         Point p1 = new Point(2, 5);
50 
51         System.out.println(p1.movePoint(5, 5));
52 
53         Point p2 = new Point(4, 7);
54 
55         System.out.println(p2.movePoint(3, 7));
56 
57  
58 
59 }
60 
61  
62 
63 }

 

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

 1 package wen;
 2 
 3  
 4 
 5 public class Rectangle {
 6 
 7 int length,width;
 8 
 9     public int getArea(int length,int width){
10 
11         return length*width;
12 
13     }
14 
15     public int getPer(int length,int width){
16 
17         return (length+width)*2;
18 
19     }
20 
21     public  void showAll(){
22 
23         System.out.println("长方形的长是"+length+"宽是"+width);
24 
25         System.out.println("周长是"+ (length+width)*2);
26 
27         System.out.println("面积是"+length*width);
28 
29     }
30 
31     
32 
33     public Rectangle(int length, int width) {
34 
35         this.length = length;
36 
37         this.width = width;
38 
39         
40 
41     }
42 
43     
44 
45     public static void main(String[] args) {
46 
47         // TODO Auto-generated method stub
48 
49         Rectangle r=new Rectangle(10, 10);
50 
51         r.showAll();    
52 
53  
54 
55     }
56 
57  
58 
59 }

 

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 wen;

 

public class computer {

 

char colour;

    int cpu;

 

    public void show() {

        System.out.println("我的颜色是:" + colour+"色" + ",型号是:" + cpu);

    }

 

    public computer(char colour, int cpu) {

        super();

        this.colour = colour;

        this.cpu = cpu;

    }

 

    public computer() {

        super();

    }

    

}

 

package wen;

 

public class test {

 

public static void main(String[] args) {

// TODO Auto-generated method stub

 computer s1=new computer();

         s1.colour='黑';

         s1.cpu=121;

         s1.show();

         computer s2=new computer('蓝',111);

         s2.show();

}

 

}

 

四、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 wen;

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 wen;

 

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();

}

 

}

 

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
(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。

 1 package wen;
 2 
 3  
 4 
 5 public class Constructor {
 6 
 7  
 8 
 9 String name;
10 
11 double height;
12 
13     int weight;
14 
15     int age;
16 
17     public Constructor (String name, double height, int weight,int age) {
18 
19 super();
20 
21 this.name = name;
22 
23 this.height = height;
24 
25 this.weight = weight;
26 
27 this.age=age;
28 
29 }
30 
31  
32 
33     public void sayhello() {
34 
35         System.out.println("hello,my name is " + name);
36 
37         System.out.println("my height is " + height + "米");
38 
39         System.out.println("my weight is " + weight + "千克");
40 
41         System.out.println("my age is " + age + "岁");
42 
43 }
44 
45  
46 
47 }
48 
49  
50 
51 package wen;
52 
53  
54 
55 public class sayHello {
56 
57  
58 
59 public static void main(String[] args) {
60 
61 // TODO Auto-generated method stub
62 
63 Constructor  a=new Constructor ("zhangsan",1.73,55,33);
64 
65 Constructor  b=new Constructor ("lishi",1.74,54,44);
66 
67 a.sayhello();
68 
69 b.sayhello();
70 
71  
72 
73 }
74 
75  
76 
77 }

 

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。

  1 package wen;
  2 
  3  
  4 
  5 public class Vehicle {
  6 
  7  
  8 
  9     private String brand;
 10 
 11  
 12 
 13     private String color;
 14 
 15  
 16 
 17     private double speed;
 18 
 19  
 20 
 21     public Vehicle(String brand,String color){
 22 
 23  
 24 
 25        this.brand=brand;
 26 
 27  
 28 
 29        this.color=color;
 30 
 31  
 32 
 33       
 34 
 35  
 36 
 37     }
 38 
 39  
 40 
 41     Vehicle(String brand, String color, double speed) {
 42 
 43  
 44 
 45        super();
 46 
 47  
 48 
 49        this.brand = brand;
 50 
 51  
 52 
 53        this.color = color;
 54 
 55  
 56 
 57        this.speed = speed;
 58 
 59  
 60 
 61     }
 62 
 63  
 64 
 65     public void run(){
 66 
 67  
 68 
 69        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);
 70 
 71  
 72 
 73 }
 74 
 75  
 76 
 77 }
 78 
 79  
 80 
 81 package wen;
 82 
 83  
 84 
 85 public class VehicleTest {
 86 
 87  
 88 
 89 public static void main(String[] args) {
 90 
 91  
 92 
 93        Vehicle v=new Vehicle("benz","black");
 94 
 95  
 96 
 97        v.run();
 98 
 99  
100 
101        Vehicle v1=new Vehicle("benz","black",13);
102 
103  
104 
105        v1.run();
106 
107 }
108 
109  
110 
111 }

 

 

 
 
posted @ 2023-06-09 19:04  coldlane  阅读(12)  评论(0编辑  收藏  举报