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 home11;

public class Point {
    int x;
    int y;

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

    public Point() {
        super();
    }

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

    public static void main(String[] args) {
        Point p1 = new Point(1, 2);
        System.out.println(p1.movePoint(3, 3));
        Point p2 = new Point(4, 5);
        System.out.println(p2.movePoint(6, 6));
    }
}

 

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 home11;

public class Rectangle {
    int length;
    int wideth;
      public int getArea(int length,int wideth){
        return length*wideth; 
      }
      public int getPer(int length,int wideth){
        return (length+wideth)*2; 
      }
      public void showAll(){
          System.out.println("长是"+length+"\n宽是"+wideth+"\n面积是"+length*wideth+"\n周长是"+(length+wideth)*2);
        }
      public Rectangle(int length, int wideth) {
          super();
          this.wideth = wideth;
          this.length = length;
      }

      public static void main(String[] args) {
          Rectangle r = new Rectangle(9, 6);
          r.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 home11;

public class Notebook {

        char color;
        int model;
        public void color() {
            char color;
        }
        public void model() {   
            int model;
        }
        public void show() {
            System.out.println("颜色是："+color+"\n型号是："+model);
        }

}
package home11;

public class Notebook_Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
                Notebook b1=new Notebook();
                b1.color='黑';
                b1.model=9700;
                b1.show();

            }

}