第十二周
作者:互联网
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 task; public class Point { int x; int y; public Point(int x0, int y0) { super(); this.x = x0; this.y = y0; } public Point() {} public String movePoint(int dx,int dy) { x=x+dx; y=y+dy; return("x,y"+x+","+y); } public static void main(String[] args) { Point p1= new Point(1,2); System.out.println(p1.movePoint(4, 4)); Point p2= new Point(5,6); System.out.println(p2.movePoint(7, 2)); } }
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 task; public class Rectangle { int length; int width; public int getArea(int width, int length) { return(width*length); } public int getPer0(int width, int length) { return((width+length)*2); } public int showAll0() { System.out.println("宽"+width); System.out.println("长"+length); System.out.println("周长"+((width+length)*2)); System.out.println("面积"+width*length); return 0; } public Rectangle(int length, int width) { super(); this.length = length; this.width = width; } public static void main(String[] args) { Rectangle i = new Rectangle(5,6); i.showAll0(); } }
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 task; public class com{ char book; int cpu; public com(char book, int cpu) { super(); this.book = book; this.cpu = cpu; } public char color(){ return book; } public int cpu(){ return cpu; } public com() { super(); } public static void main(String[] args) { com x=new com('黑',300); System.out.println(x.color()); System.out.println(x.cpu()); } }
标签:第十二,Point,int,width,length,println,public 来源: https://www.cnblogs.com/liualiu1/p/14805945.html