25．按要求编写一个Java应用程序： （1）编写一个矩形类Rect，包含： 两个属性：矩形的宽width；矩形的高height。 两个构造方法： 1．一个带有两个参数的构造方法，用于将width和h...

// Rect

package zuoye;

public class Rect {
private double width,height;
public Rect(double w,double h)
{
width=w;
height=h;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public Rect()
{
width=10;
height=10;
}
public void area()
{
System.out.println("面积为："+widthheight);
}
public void perimeter()
{
System.out.println("面积为："+(width+height)2);
}

}

///PlainRec

package zuoye;

public class PlainRect extends Rect {
private double startX,startY;
public PlainRect(double x,double y, double w,double h)
{
super(w,h);
startX=x;
startY=y;
}
public PlainRect()
{
super(0,0);
//this(0,0,0,0);
}
public boolean isInside(double x,double y)
{
if(x>=startX&&x<=(startX+getWidth())&&y=(startY-getHeight()))
{
System.out.println("在矩形内");
return true;
}
else
{
System.out.println("不在矩形内");
return false;
}
}

}

//主类

package zuoye;

public class Testplain {

public static void main(String[] args) {
    PlainRect a=new PlainRect(10,10,10,20);
    a.area();
    a.perimeter();
    a.isInside(25.58, 13);

}

}

//运行结果

面积为：200.0
面积为：60.0
不在矩形内

转载于:https://www.cnblogs.com/nicebaby/p/5892359.html