第七次上机练习

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(int
x0,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。

package computer;

public class Point {
    int x;
    int y;
    public Point(){}
        public Point(int x0,int y0){
            this.x=x0;
            this.y=y0;
        }
        public void movePoint(int dx,int dy){
            System.out.printf("移动前点的坐标为(x:%d,y:%d)\n",this.x,this.y);
            System.out.printf("移动量为(x:%d,y:%d)\n",dx,dy);
            this.x+=dx;
            this.y+=dy;
            System.out.printf("移动后点的坐标为(x:%d,y:%d)\n",this.x,this.y);
        }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Point p1=new Point(1,2);
        Point p2=new Point(3,4);
        p1.movePoint(p2.x,p1.y);
    }

}

2、定义一个矩形类Rectangle:(知识点:对象的
创建和使用)[必做题]
• 2.1 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。
• 2.2 有2个属性:长length、宽width
• 2.3 通过构造方法Rectangle(int width, int length),
分别给两个属性赋值
• 2.4 创建一个Rectangle对象,并输出相关信息

package method;

public class Rectangle {
    double length;
    double width;
    public Rectangle(double length,double width){
        this.length=length;
        this.width=width;
    }
    public double getArea(double length,double width){
        return this.length*this.width;
    }
    public double getPer(double length,double width){
        return 2*(this.length+this.width);
    }
    public void showAll(double length,double width){
        System.out.printf("长方形的长为:%3.3f,宽为:%3.3f\n",this.length,this.width);
        System.out.printf("长方形的面积为:%3.3f\n",getArea(length,width));
        System.out.printf("长方形的周长为:%3.3f\n",getPer(length,width));
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
       Rectangle rectangle=new Rectangle(4,5);
       rectangle.showAll(rectangle.length,rectangle.width);
    }

}

• 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]
• 3.1 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;
• 3.2 输出笔记本信息的方法
• 3.3 然后编写一个测试类,测试笔记本类的各个
方法。

package computer;

public class Computer {
    private char color;
    private int cpu;
    public Computer(){}
    public Computer(char color,int cpu){
        this.color=color;
        this.cpu=cpu;
    }
    public int getCpu(){
        return cpu;
    }
    public char getColor(){
        return color;
    }
    public void setCpu(int cpu){
        this.cpu=cpu;
    }
    public void setColor(char color){
        this.color=color;
    }
    public void showComputer(){
        System.out.printf("笔记本的颜色:%c\t CPU:%d\n",getColor(),getCpu());
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Computer computer=new Computer('黄',911);
         computer.showComputer();
         Computer computer2=new Computer('红',1005);
         computer2.showComputer();
    }

}

6、定义两个类,描述如下: [必做题]
• 6.1定义一个人类Person:
• 6.1.1定义一个方法sayHello(),可以向对方发出
问候语“hello,my name is XXX”
• 6.1.2有三个属性:名字、身高、年龄
• 6.1.3通过构造方法,分别给三个属性赋值
• 6.2定义一个Constructor类:
• 6.2.1创建两个对象,分别是zhangsan,33岁,
1.73;lishi,44,1.74
• 6.2.2分别调用对象的sayHello()方法。

package xz8;

public class Person {
    private String name=null;
    private double hight;
    private int age;
    public Person(String name,double hight,double d){
        this.name=name;
        this.hight=hight;
        this.age=(int)d;
    }
    public String getName(){
        return name;
    }
    public double getHight(){
        return hight;
    }
    public int getAge(){
        return age;
    }
    public void setName(String name){
        this.name=name;
    }
    public void setHight(double hight){
        this.hight=hight;
    }
    public void setAge(int age){
        this.age=age;
    }
    public void sayHello(){
        System.out.printf("hello,my name is %s!\n",name);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
     Person person1=new Person("zhangsan",33,1.73);
     Person person2=new Person("lishi",44,1.74);
     person1.sayHello();
     person2.sayHello();
    }

}

 

posted @ 2020-04-30 12:54  拾掇拾掇  阅读(147)  评论(0编辑  收藏  举报