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 text;

public class wyp{

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Point p1 = new Point(1,2);
p1.movePoint(1,2);
Point p2 = new Point(4,6);
p2.movePoint(4,6);
}

}
class Point{
int x;int y;

public Point() {

}

public Point(int x0, int y0) {
super();
this.x = x;
this.y = y;
}
void movePoint(int x0, int y0) {
x = x0+1;
y = y0+5;
System.out.println("点的位置为："+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 zuoye12;

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]

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 zuoye12;

public class Computer1 {
    char color;
    int cpu;

    public void show() {
        System.out.println("笔记本颜色是" + color + "色" + " 型号是" + cpu);
    }

    public Computer1(char color, int cpu) {
        super();
        this.color = color;
        this.cpu = cpu;
    }

    public Computer1() {
        super();
    }

}





public class Computer2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Computer1 c = new Computer1();
        c.color = '黄';
        c.cpu = 44;
        c.show();
        Computer1 c1 = new Computer1('红', 88);
        c1.show();

    }

}