建立Test_Shape类,创建一个J_Square类的对象sqare,再创建一个Shape关于J_Circle的引用对象circle; package ex07;
abstract class Shape {//建立抽象类
abstract void draw() ;//定义一个抽象方法
}
class J_Circle extends Shape{//建立子类J_Circle
void draw() {
System.out.println("通过J_Circle对象来调用draw方法");
}
}
class J_Square extends Shape{//建立子类J_Square
void draw() {
System.out.println("J_Square对象来调用draw方法");
}
}
package ex07;
public class Test_Shape {
public static void main(String[] args) {
Shape squre=new J_Square();
squre.draw();
Shape circle=new J_Circle();
circle.draw();
}
}