Wrapper class

/// Example for Wrapper class
Structural design patterns Proxy, Decorator, and Adapter also use thiw approach.
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public class WrapperExample
{
    private int x = 20;
    private int y = 10;

   
    public WrapperExample()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    public int mul(int x, int y)
    {
        Wrapper.internalClass obj = new internalClass();
        //core functionality of this method is written in the wrapped class.
        int res = obj.mul(x, y);
        return sum;
    }

    ///
    /// this class is wrapped by the WrapperExample class.
    /// we can access only inside this class.
    /// outside the class, we cant access this class.
    ///
    private class internalClass
    {       

        public int mul(int x, int y)
        {
          
            return x * y;
        }
    }
}