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 wuyue25;
public class Test2 {
    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(4,7);
            System.out.println(p1.movePoint(1,2));
            Point p2 = new Point(5,6);
            System.out.println(p2.movePoint(7,7));
        }
    }

}

 

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 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 wuyue25;
    public class Test3 {
        int length;
        int width;
        public Test3(int length, int width) {
            super();
            this.length = length;
            this.width = width;
        }
        public int getArea(){
            return length * width;
        }
        public int getPer() {
            return (length + width) * 2;
        }
        public void showAll() {
            System.out.println("长为:" + length);
            System.out.println("宽为:" + width);
            System.out.println("面积为:" + getArea());
            System.out.println("周长为:" + getPer());
        }     
        public static void main(String[] args) {
            Test3 s1 = new Test3(7,7);
            s1.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 wuyue25;
public class Computer {
       char color;
        int cpu;
          
        public void show(){
            System.out.println("笔记本颜色是"+color+"色"+",型号是"+cpu);
        }
          
        public Computer(char color,int cpu){
            super();
            this.color=color;
            this.cpu=cpu;
        }
          public Computer(){
              super();
          }

}

package wuyue25;
public class Test5 {
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub     
        Computer c = new Computer();
        c.color = '蓝';
        c.cpu = 1420;
        c.show();
        Computer c1 = new Computer('白', 777);
        c1.show();
    }
}