About Editor.addValidator

I have created a grid.Then i do this——

TextField rankEditor = new TextField();
rankEditor.addValidator(new RegexpValidator("^[0-9]*[1-9][0-9]*$", "Please enter a positive integer！"));
grid.getColumn("rank").setEditorField(rankEditor);

When i added column to the grid——

grid1.addColumn("rank", Integer.class);   

The validator just does not work.
i don't know if the "Integer.class" function in it.

Help! man