第九周上机作业

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(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。[
必作题]

public static void main(String[] args) {
        point p1=new point(1,2);
        point p2=new point(1,2);
        System.out.println("p1坐标为"+"("+p1.getX()+","+p1.getY()+")");
        System.out.println("p2坐标为"+"("+p2.getX()+","+p2.getY()+")");
        p1.movePoint(2,3);
        p2.movePoint(3,4);
        System.out.println("p1坐标为"+"("+p1.getX()+","+p1.getY()+")");
        System.out.println("p2坐标为"+"("+p2.getX()+","+p2.getY()+")");
    }
        }
public class point {
     private int x;
     private int y;

    public point() {
    }

    public point(int x, int y) {
        this.x = x;
        this.y = y;
    }
    public void movePoint(int x, int y){
        this.x=x;
        this.y=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;
    }
}

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

import java.util.Scanner;

class text{
    public static void main(String[] args) {
        Rectangle r=new Rectangle();
        System.out.println("请输入矩形长度");
        Scanner sc=new Scanner(System.in);
        int length = sc.nextInt();
        r.setLength(length);
        System.out.println("请输入矩形宽度");
        int width = sc.nextInt();
        r.setWidth(width);
    r.getAll();
    r.getArea();
    r.getPer();

    }
}

public class Rectangle {
    private int length;
    private int width;

    public Rectangle() {
    }

    public Rectangle(int length, int width) {
        this.length = length;
        this.width = width;
    }

    public int getLength(int i) {
        return length;
    }

    public int getWidth() {
        return width;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public void setWidth(int width) {
        this.width = width;
    }
    
    public void getArea(){
        System.out.println("面积为；"+width*length);
    }
   
    public void getPer(){
        System.out.println("周长为；"+(width+length)*2);
}
    public void getAll(){
        System.out.println("长度为"+length+"宽度为"+width+"面积为"+width*length+"周长为"+(width+length)*2);
}
}

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。

public class Person {
     String name;
     int age;
     double sg;
     public Person(String name,int age,double sg) {
         this.name=name;
         this.age=age;
         this.sg=sg;
     }
     public void sayHello() {
         System.out.println("Hello,my name is "+name);
         System.out.println("My age is "+age);
         System.out.println("My height is "+sg);
     }
}

public class Constructor {
    
     public static void main(String[] args) {
           Person p1=new Person("zhangsan",33,1.73);
           Person p2=new Person("lisi",44,1.74);
           p1.sayHello();
           p2.sayHello();    

            }

}