Java第十二次作业
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]
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;
y+=dy;
return ("x为"+x+" y为"+y);
}
public static void main(String[] args) {
point p1 = new point(5, 2);
System.out.println(p1.movepoint(9, 4));
point p2 = new point(49, 3);
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 homework10;
public class Test2 {
public static void main(String[] args) {
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 homework10;
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 homework10;
public class Test3 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Computer c = new Computer();
c.color = '蓝';
c.cpu = 1420;
c.show();
Computer c1 = new Computer('白', 777);
c1.show();
}
}

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