question: private void init ( ) { mainPanel = new JPanel ( ) ; mainPanel . setLayout ( new BoxLayout ( mainPanel , BoxLayout . Y_AXIS ) ) ; mainPanel . add ( connectionPanel ) ; propertiesPanel = ConnectionSynapsePropertiesPanel . createSynapsePropertiesPanel ( this ) ; mainPanel . add ( propertiesPanel ) ; eirPanel = SynapsePolarityAndRandomizerPanel . createPolarityRatioPanel ( this ) ; mainPanel . add ( eirPanel ) ; fillFrame ( ) ; }
target:  Initialize the connection panel.