class Sample
{
	public static void main (String[] args)
	{
		Derived foo = new Derived();
        Base bar = foo;
        System.out.println("Derived foo: " + foo.name);
        System.out.println("Base bar: " + bar.name);
	}
}
 
abstract class Base {
  public static String name = "Base";
  public String getName() {
  	return Base.name;
  }
}
 
class Derived extends Base {
  public static String name = "Derived";
  public String getName() {
  	// 型名を省略したりthisを使ってもいいが、
  	// いずれにせよ派生クラスごとに実装する必要がある。
  	return Derived.name;
  }
}

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