共回答了18个问题采纳率：94.4%

没明白isLargeThan是什么意思,能说得详细点儿么?

先把满足前四个条件的程序发给你,你看看行不行.

注：一个类一个java文件,运行Test3类执行.

public class Point {

x05private double x;

x05private double y;

x05public Point() {

x05x05x=0;

x05x05y=0;

x05}

x05public Point(double x,double y){

x05x05this.x=x;

x05x05this.y=y;

x05}

x05public double getX(){

x05x05return this.x;

x05}

x05public double getY(){

x05x05return this.y;

x05}

x05public void setX(double x){

x05x05this.x=x;

x05}

x05public void setY(double y){

x05x05this.y=y;

x05}

x05public Point translate(double u,double v){

x05x05this.x=this.x+u;

x05x05this.y=this.y+v;

x05x05return new Point (this.x,this.y);

x05}

}

public class Rectangle extends Point {

private double height;

private double wideth;

x05public Rectangle() {

x05x05super();

x05}

x05public Rectangle(Point p,double h,double w){

x05x05super(p.getX(),p.getY());

x05x05this.height=h;

x05x05this.wideth=w;

x05}

public double getPerimeter(){

x05return 2*(height+wideth);

}

public double getArea(){

x05return height*wideth;

}

}

public class Ellipse extends Point{

x05 private double height;

x05 private double wideth;

x05x05public Ellipse() {

x05x05x05super();

x05x05}

x05x05public Ellipse(Point p,double h,double w){

x05x05x05super(p.getX(),p.getY());

x05x05x05this.height=h;

x05x05x05this.wideth=w;

x05x05}

x05 public double getPerimeter(){

x05 x05return 2*3.14*Math.sqrt((height*height+wideth*wideth)/2);

x05 }

x05 public double getArea(){

x05 x05return 3.14*height*wideth;

x05 }

}

public class Test3 {

x05public static void main(String[] args) {

x05x05Point p=new Point(1.2,4.6);

x05x05Rectangle r=new Rectangle(p,9.2,8.7);

x05x05Ellipse e=new Ellipse(p,3.2,9.2);

x05x05Point p1=p.translate(2.8,2.9);

x05x05

x05x05System.out.println("移动后的点为x="+p1.getX()+" y="+p1.getY());

x05x05

x05x05System.out.println("长方形的周长为："+r.getPerimeter());

x05x05System.out.println("长方形的面积为："+r.getArea());

x05x05System.out.println("椭圆形的周长为："+e.getPerimeter());

x05x05System.out.println("椭圆形的面积为："+e.getArea());

x05}

}

1年前

1