第十二周Java作业
1.1、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 wn01; 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,y)坐标为" +"("+x+","+ y+")"); } public static void main(String[] args) { Point p1 = new Point(1, 2); System.out.println(p1.movePoint(3, 3)); Point p2 = new Point(4, 5); System.out.println(p2.movePoint(6, 6)); } }
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 wn02; public class Rectangle { 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(1, 2); r.showAll(); } }
3.3、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 wn03; public class not { char color; int cpu; public not() { super(); } public not(char color, int cpu) { super(); this.color = color; this.cpu = cpu; } public void show() { System.out.println("笔记本颜色是:" + color + "cpu型号是:" + cpu); } }
package wn03; public class not { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub not b1 = new not('粉',2); not b2 = new not('蓝',3); b1.show(); b2.show(); } }