LayoutUtils.java

package simurrythmia.ui.util;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JPanel;

public class LayoutUtils {

	public static JPanel createPanel(String title) {
		JPanel panel = createPanel();
		panel.setBorder(BorderFactory.createTitledBorder(title));
		return panel;
	}
	
	public static JPanel createPanel() {
		JPanel panel = new JPanel();
		panel.setLayout(new GridBagLayout());
		return panel;
	}
	
	public static GridBagConstraints layoutControls(JPanel panel, JComponent[][] controlMatrix){
		
		GridBagConstraints c = new GridBagConstraints();
		c.insets = new Insets(5, 10, 5, 10);
		c.fill = GridBagConstraints.BOTH;
		
		for (int row = 0; row < controlMatrix.length; row++){
			for (int col = 0; col < controlMatrix[row].length; col++){
				c.gridx = col;
				c.gridy = row;
				
				panel.add(controlMatrix[row][col], c);
			}
		}
		
		return c;
	}
	
	public static JPanel padding(){
		return new JPanel();
	}
}

LayoutUtilsUsage.java

//Main panel es un contenedor, controlMatrix es una matriz de 
//componentes de Swing que se van a entrar en un table layout
//de acuerdo a la matriz. 
//LayoutUtils.padding() es para poner "aire" en alguna de las celdas de la matriz :P

JComponent[][] controlMatrix = new JComponent[][] {
	new JComponent[] { constant, periodLabel, period, msLabel },
	new JComponent[] { variable, addReferenceValue }, 
	new JComponent[] { LayoutUtils.padding(), scrollPane }
};

LayoutUtils.layoutControls(mainPanel, controlMatrix);