java第十次作业

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 aaa;

public class point {
     int x;
        int y;

        public point() {
            super();
        }

        public point(int x0, int y0) {
            super();
            this.x = x0;
            this.y = y0;
        }

        public String movePoint(int dx, int dy) {
            x = dx + x;
            y = dy + y;
            return ("x为" + x + " y为" + y);
        }

        public static void main(String[] args) {
            // TODO Auto-generated method stub
            point p1 = new point(3,5);
            System.out.println(p1.movePoint(2,4));
        }
}

 

 

 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 aaa;

public class rectangle {
    int length;
    int width;

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

    public void getArea() {
        int sum1;
        sum1 = length * width;
        System.out.println("面积" + sum1);
    }

    public void getPer() {
        int sum2 = (length + width) * 2;
        System.out.println("周长" + sum2);
    }

    public void showAll() {
        System.out.println("长方形的长" + length + " 宽" + width);

    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        rectangle r = new rectangle(9,12);
        r.showAll();
        r.getArea();
        r.getPer();
    }

}

 

 

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 aaa;

public class computer {
       char color;
       int cpu;
       public void show() {
           System.out.println("笔记本颜色是" + color + "色" + " 型号是" + cpu);
       }
       public computer(char color, int cpu) {
           super();
           this.color = color;
           this.cpu = cpu;
       }
       public computer() {
           super();
       }

   }


package aaa;

public class computer1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
                computer c = new computer();
                c.color = '白';
                c.cpu = 9400;
                c.show();
                computer c1 = new computer('黑', 9700);
                c1.show();

            }

    }