Java第十一次作业
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]
package homework1; public class Point { int x; int y; public Point() { } public Point(int x0, int y0) { this.x = x0; this.y = y0; } public void movePoint(int dx, int dy) { x = dx; y = dy; } public void show() { System.out.println(x); System.out.println(y); } } package homework1; public class point1 { public static void main(String[] args) { Point p1 = new Point(1,2); Point p2 = new Point(1,3); p1.show(); p2.show(); System.out.println("移动后______________________________________"); p1.movePoint(2, 5); p2.movePoint(2, 2); p1.show(); p2.show(); }
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 homework1;
public class Rectangle { double width; double length; public Rectangle(int length, int width) { this.length = length; this.width = width; } public double getArea() { return width * length; } public double getPer() { return width + length; } public void showAll() { System.out.println(width); System.out.println(length); System.out.println(getArea()); System.out.println(getPer()); } } package homework1; public class Rectangle1 { public static void main(String[] args) { Rectangle a=new Rectangle(3,4); a.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 homework1; public class computer { char clour; int cpu; public computer() { } public computer(char clour, int cpu) { this.clour = clour; this.cpu = cpu; } public void show() { System.out.println(clour); System.out.println(cpu); } } package homework1; public class computer1 { public static void main(String[] args) { computer p1 = new computer('银',1008611); computer p2 = new computer('白', 1008612); p1.show(); p2.show(); } }