设计模式之解释器模式

1.抽象解释器
public abstract class AbstractExpression {
    public abstract Object invoke(Context context);
}

public class AddExpression extends AbstractExpression {
    @Override
    public Object invoke(Context context) {
        context.sayHello();
        Object object = new Object();
        return object;
    }
}

public class DeleteExpression extends AbstractExpression {
    @Override
    public Object invoke(Context context) {
        context.sayHello();
        Object object = new Object();
        return object;
    }
}

2.环境类
public class Context {
    public void sayHello() {
        System.out.println();
    }
}

public class Main {
    public static void main(String[] args) {
        List<AbstractExpression> list = new ArrayList<AbstractExpression>();
        list.add(new AddExpression());
        list.add(new DeleteExpression());
        Context context = new Context();

        for (AbstractExpression abstractExpression : list) {
            abstractExpression.invoke(context);
        }
    }
}