test1.java

JAVA培训用实用代码

class OldMan{
	int age = 56;
}

class YoungMan extends OldMan{
	int age = 25;
}

public class Test1{  	
	public static  void main(String args[]){
		OldMan e = new YoungMan();
		System.out.println(e.age);
		YoungMan y = (YoungMan)e;
		System.out.println(y.age);
		
	}
}