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 Homework;

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为" + x + " y为" + y);
    }
    public static void main(String[] args) {
        Point p1 = new Point(1, 2);
        System.out.println(p1.movePoint(3,4));
        Point p2 = new Point(5,6);
        System.out.println(p2.movePoint(7,8));
    }
}

 

 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 Homework;

public class Rectangle {
       int width;
        int length;

        public int getArea(int length, int width) {
            return length * width;
        }

        public int getPer(int length, int width) {
            return (length + width) * 2;
        }

        public void showAll() {
            System.out.println("长是" + length + ",宽是" + width + ",周长是"
                    + (length + width) * 2 + ",面积是" + length * width);
        }

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

        public static void main(String[] args) {
            Rectangle r = new Rectangle(1,2);
            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 Homework;

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

______________________________________

package Homework;
public class Computer1{

      public static void main(String[] args) {
          
          Computer a1=new Computer('银', 6);
          Computer a2=new Computer('白', 9);
          a1.s();
          a2.s();
      }
      
}