JAVA第十二次作业

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 work;

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) {
        // TODO Auto-generated method stub
        point p1=new point(0,0);
        System.out.println(p1.movePoint(1,1));
        point p2=new point(0,0);
        System.out.println(p2.movePoint(2,2));

    }

}

 

 

 

 

 

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 learn;

public class Rectangle {
    private int length;
    private int width;
    Rectangle(int length,int width){
        this.length=length;
        this.width=width;
    }
    public void showAll(){
        System.out.println("矩形长为:"+length+"矩形的宽为:"+width+"矩形的面积为:"+getArea()+"矩形的周长为:"+getPer());
    }
    public int getPer(){
        return 2*(length+width);
    }
    public int getArea(){
        return length*width;
    }

}






    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Rectangle r=new Rectangle(5,8);
        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 study;

public class Computer {
    char color;
    int cpu;

    public void show() {
        System.out.println(("颜色是" + color + ",型号是" + cpu));
    }
    public Computer(char color, int cpu) {
        super();
        this.color = color;
        this.cpu = cpu;
    }
    public Computer() {
        super();
    }

}





    public static void main(String[] args) {
        // TODO Auto-generated method stub
        point p1=new point(0,0);
        System.out.println(p1.movePoint(1,1));
        point p2=new point(0,0);
        System.out.println(p2.movePoint(2,2));

    }

}