java第十二周作业
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 ClassDemo;
public class Point{
int x;
int y;
Point(){
super();
}
Point(int x0,int y0){
this.x = x0;
this.y = y0;
}
public void movePoint (int dx,int dy) {
x = dx + x;
y = dy + y;
System.out.println(x+" "+ y);
}
}
package ClassDemo;
public class PointTest {
public static void main(String[] args) {
Point p1 = new Point(1,2);
p1.movePoint(2, 1);
Point p2 = new Point(1,2);
p1.movePoint(3, 1);
}
}

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width2.3 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 ClassDemo;
public class Rectangle {
int length;
int width;
Rectangle(int width, int length) {
this.length = length;
this.width = width;
}
public int getArea() {
return this.width *this.length;
}
public int getPer() {
return (this.width + this.length) * 2;
}
public void showAll() {
System.out.println("长是:"+this.length+"宽是:"+this.width);
}
}
package ClassDemo;
public class RectangleTest {
public static void main(String[] args) {
Rectangle r1 = new Rectangle(2,3);
System.out.println("面积是:"+r1.getArea());
System.out.println("周长是:"+r1.getPer());
r1.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 ClassDemo;
public class NoteBook {
char color;
int cpu;
NoteBook(){
super();
}
NoteBook(char color,int cpu){
this.color = color;
this.cpu = cpu;
}
public void showAll() {
System.out.println("笔记本的颜色:"+this.color+" "+"笔记本的型号:"+this.cpu);
}
}
package ClassDemo;
public class NoteBookTest {
public static void main(String[] args) {
NoteBook n1 = new NoteBook('黑',1024);
n1.showAll();
}
}

posted on 2021-05-24 22:20 chenyulin11 阅读(44) 评论(0) 收藏 举报
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