Define class and methods in zscript
From Documentation
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Thanks to the power of BeanShell, the implementation of Java classes can be done in zscript as follows.
<zscript>
public class MyWindow extends Window {
}
</zscript>
<window use="MyWindow"/>
And you can define methods in zscript
<window>
<zscript><![CDATA[
public void sayHello(){
alert("hello");
}
]]>
</zscript>
<button label="Say Hello!" onClick="sayHello()" />
</window>