按要求编写一个Java应用程序： 定义一个类，描述一个矩形，包含有长宽两种属性，和计算面积方法。 编写一个类，继承自矩形类，同时该类描述长方体，具有长宽高属性， 和计算体积的方法。

Posted 2020-08-09

package jvxing;

public class Jvxing
{
    //成员变量
    private double width;
    private double chang;
    public double getWidth() {
        return width;
    }
    public void setWidth(double width) {
        this.width = width;
    }
    public double getChang() {
        return chang;
    }
    public void setChang(double height) {
        this.chang = height;
    }
    
    
    //成员方法
    public double mianji()
    {
        return this.width*this.chang;
    }
}

package jvxing;

public class Cft extends Jvxing
{
    //定义新的成员变量高
    private double height;

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }
    
    //定义新的成员方法求体积
    
    public double tiji()
    {
        return this.getChang()*this.getHeight()*this.getWidth();
    }
}

package jvxing;

public class Text_jvxing {

    public static void main(String[] args) {

        //实例化矩形对象求面积
        Jvxing j= new Jvxing();
        j.setWidth(10);
        j.setChang(15.3);
        System.out.println("矩形的长为："+j.getChang()+"  宽为："+j.getWidth());
        System.out.println("矩形的面积为："+j.mianji());
        
        //实例化长方体对象求体积
        Cft c = new Cft();
        c.setChang(2);
        c.setHeight(3.2);
        c.setWidth(100);
        System.out.println("长方体的长为："+c.getChang()+"  宽为："+c.getWidth()+"  高为："+c.getHeight());
        System.out.println("长方体的体积为："+c.tiji());
                
    }

}