two way adapter???????

首先感谢banq大哥给我们整理了这么多关于设计模式的文章。非常感谢！！
我看到你讲的adapter那章时，觉得two-way-adapter你是不是没解释清楚。我想代码是不是应该如下：


public interface IRoundPeg {
	void insertIntoHole(String str);
}

public interface ISquarePeg {	
	void insert(String str);
}

public class RoundPeg implements IRoundPeg{
	
	public void insertIntoHole(String str){
		System.out.println("SquarePeg------->insert");
	}
}

public class SquarePeg implements ISquarePeg{
	
	public void insert(String str){
		System.out.println("SquarePeg------->insert");
	}
	
	public void someOtherMethod(){
		
	}
}

public class TwoWayPegAdapter implements IRoundPeg,ISquarePeg{
	private IRoundPeg roundPeg;
	private ISquarePeg squarePeg;
	
	public TwoWayPegAdapter(IRoundPeg roundPeg,ISquarePeg squarePeg) {
		this.roundPeg=roundPeg;
		this.squarePeg=squarePeg;
	}
	
	public void insertIntoHole(String str) {
		roundPeg.insertIntoHole(str);
	}
	
	public void insert(String str) {
		squarePeg.insert(str);
	}

}