5.21Java十二周作业
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 lei; public class test2 { int x; int y; public test2(int x0, int y0) { super(); this.x = x0; this.y = y0; } public test2() { 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) { test2 p1 = new test2(3, 6); System.out.println(p1.movePoint(4, 4)); test2 p2 = new test2(6, 8); System.out.println(p2.movePoint(3, 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 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 lei; public class tese1 { int width; int length; 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("长是" + length + ",宽是" + width + ",周长是" + (length + width) * 2 + ",面积是" + length * width); } public tese1(int width, int length) { super(); this.width = width; this.length = length; } public static void main(String[] args) { tese1 r = new tese1(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 lei; 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 lei; public class Computer1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Computer c = new Computer(); c.color = '黄'; c.cpu = 130; c.show(); Computer c1 = new Computer('红', 60); c1.show(); } }