sample8_9.java

来自「Java SE 6.0前11章示的示例代码,简单易学」· Java 代码 · 共 22 行

package wyf.jc;
public class Sample8_9
{
	public static void main(String[] args)
	{
      Fruit f=new Apple();
      Pear p=(Pear)f;
	}    
}
//水果类
class Fruit
{
}
//苹果类
class Apple extends Fruit
{
}
//梨类
class Pear extends Fruit
{
}