JAVA 練習問題13-3答え(P527)

■A.java

//宣言時にfinalが付いているクラスは継承できない
public final class A extends Y {
	public void a() {
		System.out.print("Aa");
	}

	public void b() {
		System.out.print("Ab");

	}

	public void c() {
		System.out.print("Ac");
	}

}

■B.java

```java

public class B extends Y {
	public void a() {
		System.out.print("Ba");

	}

	public void b() {
		System.out.print("Bb");
	}

	public void c() {
		System.out.print("Bc");
	}

}

■X.java

public interface X {
	void a();

}

■Y.java

public abstract class Y implements X {
	public abstract void a();
	public abstract void b();

}

■Main23.java

public class Main23 {
	public static void main(String[] args) {

		X obj = new A();

		//練習 13-3
		A obj1 = new A();
		B obj2 = new B();

		Y[] objj = new Y[2];
		objj[0] = new A();
		objj[1] = new B();

		for(Y temporaryVariable : objj) {
			temporaryVariable.b();
		}
	}
}

■実行結果
AbBb