Read variables set by assignment

Next step. I got this far. How do I set the value of variable?

@Override
public void closeView() {
	// TODO Auto-generated method stub
	Collection<Variable> x = this.api.getVariableModel().get(new Filter<Variable>() {
		@Override
		public boolean accept(Variable element) {
			return element.getDisplayName().equals("MY_VARIABLE_NAME");
		}
	});		
	x.toArray()[0]._____now_what?
}