java第十二周作业

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,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pl和p2的坐标。[必作题]

 

package homework1;

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) {
        x = dx;
        y = dy;
    }

    public void show() {
        System.out.println(x);
        System.out.println(y);
    }
}

 

package homework1;

public class point1 {

    public static void main(String[] args) {
        
        Point p1 = new Point(1,2);
        Point p2 = new Point(1,3);
        p1.show();
        p2.show();
        
        System.out.println("移动后______________________________________");
        p1.movePoint(2, 5);
        p2.movePoint(2, 2);
        p1.show();
        p2.show();
    }
    

 

 

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、getPer0求周长，showAll0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-个Rectangle对象， 并输出相关信息

package homework1;

public class Rectangle {
    double width;
    double length;

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

    public double getArea() {
        return width * length;
    }

    public double getPer() {
        return width + length;
    }

    public void showAll() {
        System.out.println(width);
        System.out.println(length);
        System.out.println(getArea());
        System.out.println(getPer());
    }

}

package homework1;

public class Rectangle1 {

    public static void main(String[] args) {
        Rectangle a=new Rectangle(3,4);
        a.showAll();

    }

}

 

 

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 homework1;

public class computer {
    char clour;
    int cpu;

    public computer() {

    }

    public computer(char clour, int cpu) {
        this.clour = clour;
        this.cpu = cpu;
    }

    public void show() {
        System.out.println(clour);
        System.out.println(cpu);
    }
}

package homework1;

public class computer1 {

    public static void main(String[] args) {
        computer p1 = new computer('银',1008611);
        computer p2 = new computer('白', 1008612);
        p1.show();
        p2.show();
        
    }

    }