Veteran's Blog

共分5个文件：文件名分别是Iabstract.as AbstractDemo.as firstObj.as AbstractArea.as test.fla
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Iabstract.as :
interface Iabstract{
    function area()
    }
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AbstractDemo.as :
class AbstractDemo implements Iabstract {
    var x:Number;
    var y:Number;
    public function AbstractDemo(a, b) {
        x = a;
        y = b;
    }
    public function area() {
    }
}
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firstObj.as :
class firstObj extends AbstractDemo {
    public function firstObj(a, b) {
        super(a, b);
    }
    public function area() {
        return x*y;
    }
}
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AbstractArea.as :
class AbstractArea {
    var r:firstObj;
    var a:AbstractDemo;
    public function AbstractArea() {
        r = new firstObj(10, 9);
        a = r;
        trace(a.area());
    }
}
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test.fla:
myobj=new AbstractArea()