习题

package xiti10;

public class xiti100201
{

    public xiti100201()
    {
        System.out.println("父类.习题");
    }
    
    public void doSomething()
    {
        System.out.println("父类.习题01");
    }
    
    public void doAnything()
    {
        System.out.println("父类.习题02");
    }
    
}
class xiti100202 extends xiti100201
{
    public void doAnything()
    {
        System.out.println("子类.习题02");
    }
}

package xiti10;

public class xiti1002 
{

    public static void main(String[] args) 
    {
        xiti100202 xi = new xiti100202();
        
        xiti100201 x = new xiti100202();
        
        x.doSomething();
        
        x.doAnything();
        

    }

}