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7  Jython

Jython is a scripting language based on the Python specification.  The advantages of Jython are:

• No need to compile code
• More descriptive than Java
• Java classes are accessible through Jython

The interface shown in figure 1 below was created with Jython.  Clicking the "Start" and "Stop" buttons interact with JavaHMI's MockDigitalOutput.

Figure 1.  Jython GUI screen shot.

The source for the interface shown in figure 1 is listed below in Code Example 1.

from java import awt
from javax import swing
from net.sourceforge import javahmi

do = javahmi.mockup.MockDigitalOutput()
do.name = "Motor"

class MyListener(awt.event.ActionListener):
    def actionPerformed(self,event):
        if event.getActionCommand() == "Start":
	    print "Starting!"
	    do.write(1)
	elif event.getActionCommand() == "Stop":
	    print "Stopping!"
	    do.write(0)

frame = swing.JFrame("Subclassing Example")
container = frame.getContentPane()
container.setLayout(awt.FlowLayout())

button1 = swing.JButton("Start")
button1.addActionListener(MyListener())
container.add(button1)

button2 = swing.JButton("Stop")
button2.addActionListener(MyListener())
container.add(button2)

frame.setSize(150,120)
frame.pack()
frame.setVisible(1)

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