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leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine. In 2013 it was ported to the LEGO EV3 brick.

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package lejos.hardware.sensor;

import lejos.hardware.port.AnalogPort;
import lejos.hardware.port.Port;

/**
 * Basic sensor driver for the Lego EV3 Touch sensor
 * @author andy
 *
 */
/**
 * Lego EV3 Touch sensor

 * The analog EV3 Touch Sensor is a simple but exceptionally precise tool that detects when its front button is pressed or released.
 * 
 *  * 
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 * Supported modes
Mode name Description unit(s) Getter
Touch Detects when its front button is pressed Binary  {@link #getTouchMode() }
 * 
 * 
 * 
 * 
 * See  Sensor Product page 
 * See  The
 *      leJOS sensor framework
 * See {@link lejos.robotics.SampleProvider leJOS conventions for
 *      SampleProviders}
 * 
 *      
 * 
 * 
 * @author Your name
 * 
 */
public class EV3TouchSensor extends AnalogSensor 
{
    
    public EV3TouchSensor(AnalogPort port)
    {
        super(port);
        init();
    }

    public EV3TouchSensor(Port port)
    {
        super(port);
        init();
    }
    
    protected void init() {
      setModes(new SensorMode[]{ new TouchMode() }); 
    }

    
   
    
    /**
     * Lego EV3 Touch sensor, Touch mode

     * Detects when its front button is pressed
     * 
     * 

     * Size and content of the sample

     * The sample contains one element, a value of 0 indicates that the button is not presse, a value of 1 indicates the button is pressed.
     * 
     * 
     * 
     * @return A sampleProvider
     * See {@link lejos.robotics.SampleProvider leJOS conventions for
     *      SampleProviders}
     */
    public SensorMode getTouchMode()
    {
        return getMode(0);
    }

    
    private class TouchMode implements SensorMode {
        @Override
        public int sampleSize()
        {
            return 1;
        }

        @Override
        public void fetchSample(float[] sample, int offset)
        {
            sample[offset] = (port.getPin6() > EV3SensorConstants.ADC_REF/2f ? 1.0f : 0.0f);
        }

        @Override
        public String getName()
        {
           return "Touch";
        }
     
    }

}

Supported modes
Mode name	Description	unit(s)	Getter
Touch	Detects when its front button is pressed	Binary	{@link #getTouchMode() }