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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 wxp;

public class wxp {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 Point p1 = new Point(2.5, 6.0);
         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);
     }
 
	}

  

 

 

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 wxp;

public class wxp {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Rectangle a = new Rectangle(5, 6);
        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 zc = (width + length) * 2;
        System.out.println("周长为" + zc);
    }

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


     }
 
	}

  

 

 

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 wxp;

public class wxp {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		notebook a = new notebook('h',0000);
        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("笔记本颜色是" + colour + "型号是 " + cpu + "");
    }
}

  

 

 

posted @ 2021-05-25 19:13  吴显平  阅读(287)  评论(0)    收藏  举报