android check box star style

I am new to android development but I know how to create a starStyled checkbox using xml as

<CheckBox style="?android:attr/starStyle">

But how to set starStyle using code i.e, by creating check box like this

Ch开发者_Python百科eckBox cb=new CheckBox(this);

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instead of using the constructor CheckBox cb=new CheckBox(this); ,why don't you use CheckBox cb=new CheckBox(this,null,android.R.attr.starStyle);