Java论述题请求大神支援😭

public class TestRect {

	public static void main(String[] args) {
		Rect rect = new Rect();
		System.out.println("矩形周长:" + rect.perimeter());
		MyRect myRect = new MyRect(20,30);
		System.out.println("周长："+myRect.perimeter());
		System.out.println("面积："+myRect.area());
		
	}
}
class Rect{
	double width;
	double height;
	public Rect() {
		this.width = 10;
		this.height = 10;
	}
	public Rect(double width,double height) {
		this.width = width;
		this.height = height;
	}
	public double perimeter() {
		return (width+height)*2;
	}
	
}
class MyRect extends Rect{
	
	public MyRect() {
	}
	public MyRect(double width,double height) {
		super(width,height);
	}
	
	double area() {
		return width*height;
	}
}

public class Rect {
	private int width;
	private int height;
	
	
	public Rect() {
		super();
	}
	public int perimeter(){
		int zc=(height+width)*2;
		return zc;
	}
	public Rect(int width, int height) {
		super();
		this.width = width;
		this.height = height;
	}
	public int getWidth() {
		return width;
	}
	public void setWidth(int width) {
		this.width = width;
	}
	public int getHeight() {
		return height;
	}
	public void setHeight(int height) {
		this.height = height;
	}
	
}

public class MyRect extends Rect{
	public int area(){
	    int mj=getWidth()*getHeight();
		return mj;
	} 
}

public class TestReact {
	public static void main(String[] args) {
		Rect rect=new Rect(20, 10);

		System.out.println("宽度："+rect.getWidth()+",高度为:"+rect.getHeight()+"的矩形周长为："+rect.perimeter());
		MyRect myRect=new MyRect();
		myRect.setHeight(10);
		myRect.setWidth(20);
		System.out.println("宽度："+myRect.getWidth()+",高度为:"+myRect.getHeight()+"的矩形周长为："+myRect.perimeter());
		System.out.println("宽度："+myRect.getWidth()+",高度为:"+myRect.getHeight()+"的矩形的矩形面积为："+myRect.area());
	}
}

代码如上，万望采纳。

我可以帮你写哦，关注一下，我帮你写。

代码如下：

1、矩形类：Rect

/**
 * 矩形类
 * @author zxl
 * @date 2021/05/28
 **/
public class Rect {
    public int width;
    public int height;

    public Rect() {
        this.width = 10;
        this.height = 10;
    }

    public Rect(int width, int height) {
        this.width = width;
        this.height = height;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int perimeter(){
        return (width+height)*2;
    }

}

2、我的矩形类：MyRect 

/**
 * 我的矩形类
 * @author zxl
 * @date 2021/05/28
 **/
public class MyRect extends Rect{
    public MyRect() {
    }

    public MyRect(int width, int height) {
        super(width, height);
    }

    public int area(){
        return super.height*super.width;
    }
}

3、测试形状类：TestRect 

/**
 * 测试矩形
 * @author zxl
 * @date 2021/05/28
 **/
public class TestRect {
    public static void main(String[] args){
        // 测试父类默认长宽周长
        Rect rect = new Rect();
        int perimeter = rect.perimeter();
        System.out.println("测试父类默认长宽周长:"+perimeter);

        // 测试父类指定长宽周长
        Rect rect1 = new Rect(20,20);
        int perimeter1 = rect1.perimeter();
        System.out.println("测试父类指定长宽周长:"+perimeter1);

        // 测试子类默认长宽周长
        MyRect myRect = new MyRect();
        int perimeter3 = myRect.perimeter();
        System.out.println("测试子类默认长宽周长:"+perimeter3);

        // 测试子类指定长宽周长
        MyRect myRect1 = new MyRect(20,20);
        int perimeter4 = myRect1.perimeter();
        System.out.println("测试子类指定长宽周长:"+perimeter4);

        // 测试子类默认长宽面积
        MyRect myRect2 = new MyRect();
        int area = myRect2.area();
        System.out.println("测试子类默认长宽面积:"+area);

        // 测试子类指定长宽面积
        MyRect myRect3 = new MyRect(20,20);
        int area1 = myRect3.area();
        System.out.println("测试子类指定长宽面积:"+area1);

    }
}

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