第十二次Java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 test;
 
public class test {
    public static 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(4, 3));
            Point p2 = new Point(2, 3);
            System.out.println(p2.movePoint(4, 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 test;
 
public class test {
    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("长方形的长为" + length + ",宽为" + width + ",周长为"
                + (length + width) * 2 + ",面积为" + length * width);
    }
 
    public Rectangle(int length, int width) {
        super();
        this.length = length;
        this.width = width;
 
    }
 
    public static void main(String[] args) {
        Rectangle r = new Rectangle(4, 7);
        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 test;
 
 
public class test {
    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 test1;
 
public class test1 {
    public static class Test {
 
        /**
         * @param args
         */
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Computer c = new Computer();
            c.coulour = '黑';
            c.cpu = 123;
            c.show();
            Computer c1 = new Computer('白', 456);
            c1.show();
 
        }
 
    }
 
}