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路径：

代码：

Shape.javapackage draw;

public class Shape {

public double getGirth(){

return 0;

}

public double getArea(){

return 0;

}

@32313133353236313431303231363533e78988e69d8331333332613761Override

public String toString() {

return "Shape [getGirth()=" + getGirth() + ", getArea()=" + getArea()

+ "]";

}

}

Rectangle.javapackage draw;

public class Rectangle extends Shape{

private double width;

private double height;

@Override

public double getGirth() {

return (width+height)*2;

}

@Override

public double getArea() {

return width*height;

}

@Override

public String toString() {

return super.toString();

}

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;

}

}

Square,javapackage draw;

public class Square extends Shape {

private double side;

@Override

public double getGirth() {

return side*4;

}

@Override

public double getArea() {

return side*side;

}

@Override

public String toString() {

return super.toString();

}

public double getSide() {

return side;

}

public void setSide(double side) {

this.side = side;

}

}

text,javapackage draw;

public class tsest {

/**

* @param args

*/

public static void main(String[] args) {

Rectangle rec = new Rectangle();

rec.setHeight(10);

rec.setWidth(20);

System.out.println("矩形");

System.out.println(rec.toString());

Square squ = new Square();

squ.setSide(5);

System.out.println("正方形");

System.out.println(squ.toString());

}

}

测试结果：