麻烦高手啊

[QIANZHENTAO]

分别定义一个形状(Shape)的抽象类和接口，该抽象类或接口有求面积的抽象方法getArea()，并且有正方形（Rect）和圆形(Circle)继承或实现Shape，利用类方法的重写，覆盖抽象方法getArea(),然后定义一个Test类,在main方法中生成具体对象，分别计算各个图形的面积
注意：
1.重写要求覆盖父类的求面积的方法getArea();

[liuqianqian]

楼主好好想想；无非就是继承和实现接口，没有什么的！加油！自己做！

[jcyan]

作业题自己搞定

[xuhua205]

去《thinking in java》书上看吧，那里有经典例子

[ZiSheng]

[Quote=引用 2 楼 xuhua205 的回复:]
去《thinking in java》书上看吧，那里有经典例子
[/Quote]
自己看书，丰衣足食

[scarlet365]

LZ果然很懒...这东西,有发帖这功夫都做完了-___-||

[whlusha720]

这么简单的作业 - -！

[lizhi1026]

public abstract class TestTable {
public abstract float getArea(float r);

}

public class A extends TestTable {
// Rect
public float getArea(float r) {
float area = r * r;
return area;
}
}

public class B extends TestTable {
// Circle
public float getArea(float r) {
float area = (float) (Math.PI * r * r);
return area;
}
}

[風男]

这么简单的作业都跑上论坛来发帖
唉。。。

[gmh521]

仅供参考，希望还是自己试着写写
public abstract class Shape{
public abstract float getArea(float r);

}

public class Rect extends Shape{
public float getArea(float r) {
float area = r * r;
return area;
}
}

public class Circle extends Shape{
public float getArea(float r) {
float area = (float) (Math.PI * r * r);
return area;
}
}
public class Test {
public static void main(String[] args){
Rect rt=new Rect();
System.out.println(rt.getArea(12));
Circle cl=new Circle();
System.out.println(cl.getArea(12));
}

}

[shenjie1989]

public abstract class Shape {

public abstract double Getarea(double length);

}
public class Rect extends Shape {
public double Getarea(double length){
return length*length;
}

}
public class Circle extends Shape {
final double PI=3.14;
public double Getarea(double length){
return PI*length*length;
}
}
public class Test {
public static void main(String[] args) {
Rect Jie = new Rect();
Circle S = new Circle();
System.out.println(S.Getarea(1));
System.out.println(Jie.Getarea(6));
}
}

[shenjie1989]

public interface Shape {
double Getarea(double length);

}
public class Circle implements Shape {
private final double PI = 3.14;

public double Getarea(double length) {
return PI * length * length / 4;
}

}
public class Rect implements Shape {
public double Getarea(double length) {
return length * length;
}
}
public class Test {
public static void main(String[] args) {
Rect Jie = new Rect();
Circle S = new Circle();
System.out.println(Jie.Getarea(2));
System.out.println(S.Getarea(6));
}
}