java第十二次作业

1.定义一个点类Point，包含两个成员变量x，y分别表示x和y坐标，2个构造器Point( )和Point(int x0,int y0)，
以及一个movePoint(int dx,int dy)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p1和p2的坐标。

package usb;



public class maopao{
int x;
int y;
public maopao(int x0,int y0){
    super();
    this.x=x0;
    this.y=y0;

}
public maopao()
{super();

}
    public String movePrint(int dx,int dy) {
        x=dy+x;
        y=dy+y;
        return("x是"+x+",Y是"+y);
        
                
    }
    public static void main (String[] arge){
 maopao p1 =new maopao(0,0);
System.out.println(p1.movePrint(2,2));
maopao p2 =new maopao(-1,5);
System.out.println(p2.movePrint(3, 1));
    }
       
           }

2、定义一个矩形类Rectangle: (知识点: 对象的创建和使用)[必做题]
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 有2个属性:长length、宽width
3 通过构造方法Rectangle(int width, int length),分别给两个属性赋值
4 创建-个Rectangle对象，并输出相关信息

package homework12;

public class mai {
    
      int length;
        int width;

        public mai(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(20, 5);
            r.showAll();
            r.getArea();
            r.getPer();
        }

}

package homework12;

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(20, 5);
            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]
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;
2 输出笔记本信息的方法
3 然后编写一-个测试类，测试笔记本类的各个方法。

package homework12;

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(20, 5);
            r.showAll();
            r.getArea();
            r.getPer();
        }

}

java第十二次作业

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