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]
public class tset1 { public static void main(String[] args) { Point p1 = new Point(2.5, 6.0); Point p2 = new Point(); p1.movePoint(); p2.movePoint(); } } class Point { double x; double y; public Point() { super(); } public Point(double x, double y) { this.x = x; this.y = y; } public void movePoint() { System.out.println("点的坐标为"); System.out.println(+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
public class test2 { public static void main(String[] args) { Rectangle a = new Rectangle(5, 6); a.getArea(); a.getPer(); a.showAll(); } } class Rectangle { int length; int width; public Rectangle(int dwidth, int dlength) { super(); width = dwidth; length = dlength; } public void getArea() { int Area = width * length; System.out.println("面积为" + Area); } public void getPer() { int zc = (width + length) * 2; System.out.println("周长为" + zc); } public void showAll() { int Area = width * length; int zc = (width + length) * 2; System.out.println("长为" + length + "宽为" + width + "面积为" + Area + "周长为" + zc); } }
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。
public class test3 { public static void main(String[] args) { // TODO Auto-generated method stub notebook a = new notebook('黑', 9000); a.zhan(); } } class notebook { char colour; int cpu; public notebook(char colour, int cpu) { this.colour = colour; this.cpu = cpu; } public notebook() { super(); } public void zhan() { System.out.println("笔记本颜色为" + colour + "型号为" + cpu + ""); } }