Java抽象类和借口两种方法

Question

java 使用抽象类和借口两种方法，定义图形然后分别基于抽象类，接口派生若干子类，分别计算三角形，长方形，椭圆面积。

Answer 1

//1、抽象类的方式
abstract class Shape {
    public abstract double shapeS();	//面积
}

public class Rectangle extends Shape {
    private double l;	//长
    private double w;	//宽

    public double shapeS(){
        return 0.5*l*w;
    }

    public Rectangle(double l,double w){
        this.l=l;
        this.w=w;
    }
}

public class Squrtz extends Shape {
    private double l;	//长
    private double w;	//宽

   
    public double shapeS(){
        return l*w;
    }

    public Squrtz(double l,double w){
        this.l=l;
        this.w=w;
    }
}


public class tuoyuan extends Shape {
    private double l;	//长半轴
    private double w;	//短半轴

   
    public double shapeS(){
        return Maht.PI*l*w;
    }

    public tuoyuan(double l,double w){
        this.l=l;
        this.w=w;
    }
}



//2、接口方式
public interface Shape {
	public double shapeS();
}

public class Rectangle implements Shape{
    private double l;	//长
    private double w;	//宽
    public Rectangle(double l,double w){
        this.l=l;
        this.w=w;
    }

	@Override
	public double shapeS() {
		
		 return 0.5*l*w;
	}

}

public class Squrtz implements Shape{
    private double l;	//长
    private double w;	//宽
    public Squrtz(double l,double w){
        this.l=l;
        this.w=w;
    }

	@Override
	public double shapeS() {
		
		 return l*w;
	}

}

public class tuoyuan implements Shape{
    private double l;	//长半轴
    private double w;	//短半轴
    public tuoyuan(double l,double w){
        this.l=l;
        this.w=w;
    }

	@Override
	public double shapeS() {
		  return Maht.PI*l*w;
	}

}

以作答。抽象类和接口方法。

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