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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 wxp;
public class wxp {
public static void main(String[] args) {
// TODO Auto-generated method stub
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
package wxp;
public class wxp {
public static void main(String[] args) {
// TODO Auto-generated method stub
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。
package wxp;
public class wxp {
public static void main(String[] args) {
// TODO Auto-generated method stub
notebook a = new notebook('h',0000);
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("笔记本颜色是" + colour + "型号是 " + cpu + "");
}
}


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