Add an icon in Vaadin Grid

What you're looking for is the method grid.addComponentColumn(). Inside that component renderer you can check whatever value and return a different component depending on that value.

Grid<Person> grid = new Grid<>();
grid.addComponentColumn(item -> {
	Icon icon;
	if(item.isAdult()){
		icon = VaadinIcon.CHECK_CIRCLE.create();
		icon.setColor("green");
	} else {
		icon = VaadinIcon.CLOSE_CIRCLE.create();
		icon.setColor("red");
	}
	return icon;
})
	.setKey("adult")
	.setHeader("Adult")
	.setComparator(Comparator.comparing(Person::isAdult));

I have exactly this setup for a boolean column (except that I don't use Person class), so I left some minor improvements like icon-color and comparator here ;)