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TOVAL comprises a set of java classes for common programming issues. It includes utils for arrays, lists, sets and collections for convenient handling and modification, but also support for mathematic definitions concerning logic (clauses + resolution) together with some algorithms for permutations, powersets and resolution. Additionally it contains a number of types for multisets, matrices with object keys and much more.

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package de.invation.code.toval.graphic.component;

import java.util.Arrays;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;

import de.invation.code.toval.validate.Validate;

public class EnumComboBox> extends JComboBox{

	private static final long serialVersionUID = -3998550187333465250L;

	public EnumComboBox(Class enumeration){
		this(enumeration, false);
	}
	
	public EnumComboBox(Class enumeration, boolean allowNull){
		Validate.notNull(enumeration);
		int padding = allowNull ? 1 : 0;
		Object[] objects = Arrays.copyOf(enumeration.getEnumConstants(), enumeration.getEnumConstants().length + padding);
		setModel(new DefaultComboBoxModel(objects));
	}

	@SuppressWarnings("unchecked")
	@Override
	public E getSelectedItem() {
		try{
			return (E) super.getSelectedItem();
		} catch(Exception e){
			return null;
		}
	}
	
	

}