12周作业

第一题

package chap9;

public class text1 {

    public static void main(String[] args) {
        Point p1 = new Point(2.0, 4.5);
        Point p2 = new Point();
        p1.movePoint();
        p2.movePoint();
    }

}

class Point {
    double x;
    double y;

    public Point() {
        super();
    }

    public Point(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public void movePoint() {
        System.out.println("点的坐标为");
        System.out.println(+x + "," + y);
    }
}

 

 第二题

package chap9;

public class text2 {

    public static void main(String[] args) {
        Rectangle a = new Rectangle(4, 5);
        a.getArea();
        a.getPer();
        a.showAll();
    }

}

 class Rectangle {
    int length;
    int width;

    public Rectangle(int dwidth, int dlength) {
        super();
        width = dwidth;
        length = dlength;
    }

    public void getArea() {
        int Area = width * length;
        System.out.println("面积为" + Area);
    }

    public void getPer() {
        int Per = (width + length) * 2;
        System.out.println("周长为" + Per);
    }

    public void showAll() {
        int Area = width * length;
        int Per = (width + length) * 2;
        System.out.println("长为" + length + "宽为" + width + "面积为" + Area + "周长为" + Per);
    }
}

 

 第三题

package chap9;

public class text3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        notebook a = new notebook('黑', 9800);
        a.zhan();
    }
}

class notebook {
    char colour;
    int cpu;

    public notebook(char colour, int cpu) {
        this.colour = colour;
        this.cpu = cpu;
    }

    public notebook() {
        super();
    }

    public void zhan() {
        System.out.println("笔记本颜色为" + colour + "型号为" + cpu + "");
    }
}