5.21第十一次作业

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 week12;

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, 3);
        System.out.println(p1.movePoint(2, 2));
        Point p2 = new Point(5, 7);
        System.out.println(p2.movePoint(3, 5));

    }

}

 

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 week12;

public class Rectangle {

    /**
     * @param args
     */
    int length;
    int width;
    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("长方形的长是"+length+",宽是"+width+",周长是"+ (length+width)*2+",面积是"+length*width);
    }
    
    public Rectangle(int length, int width) {
        super();
        this.length = length;
        this.width = width;
        
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Rectangle r=new Rectangle(2, 3);
        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 week12;

public class Computer {
    char coulour;
    int cpu;

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

    public Computer(char coulour, int cpu) {
        super();
        this.coulour = coulour;
        this.cpu = cpu;
    }

    public Computer() {
        super();
    }
    
}




package week12;

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Computer c=new Computer();
        c.coulour='红';
        c.cpu=1;
        c.show();
        Computer c1=new Computer('黑',2);
        c1.show();
    }
    
            
}