public final void deleteSelectedObjects(){
  Component[] components=getComponents();
  List<DisplayNode> graphNodes=new ArrayList<>();
  List<IDisplayEdge> graphEdges=new ArrayList<>();
  for (  Component comp : components) {
    if (comp instanceof DisplayNode) {
      if (!isDeleteVariablesAllowed()) {
        continue;
      }
      DisplayNode node=(DisplayNode)comp;
      if (node.isSelected()) {
        graphNodes.add(node);
      }
    }
 else     if (comp instanceof IDisplayEdge) {
      IDisplayEdge edge=(IDisplayEdge)comp;
      if (edge.isSelected()) {
        graphEdges.add(edge);
      }
    }
  }
  for (  DisplayNode graphNode : graphNodes) {
    removeNode(graphNode);
  }
  for (  IDisplayEdge displayEdge : graphEdges) {
    try {
      removeEdge(displayEdge);
      resetEdgeOffsets(displayEdge);
    }
 catch (    Exception e) {
      if (isNodeEdgeErrorsReported()) {
        JOptionPane.showMessageDialog(JOptionUtils.centeringComp(),e.getMessage());
      }
    }
  }
}

public final void deleteSelectedObjects ( ) { Component [ ] components = getComponents ( ) ; List < DisplayNode > graphNodes = new ArrayList < > ( ) ; List < IDisplayEdge > graphEdges = new ArrayList < > ( ) ; for ( Component comp : components ) { if ( comp instanceof DisplayNode ) { if ( ! isDeleteVariablesAllowed ( ) ) { continue ; } DisplayNode node = ( DisplayNode ) comp ; if ( node . isSelected ( ) ) { graphNodes . add ( node ) ; } } else if ( comp instanceof IDisplayEdge ) { IDisplayEdge edge = ( IDisplayEdge ) comp ; if ( edge . isSelected ( ) ) { graphEdges . add ( edge ) ; } } } for ( DisplayNode graphNode : graphNodes ) { removeNode ( graphNode ) ; } for ( IDisplayEdge displayEdge : graphEdges ) { try { removeEdge ( displayEdge ) ; resetEdgeOffsets ( displayEdge ) ; } catch ( Exception e ) { if ( isNodeEdgeErrorsReported ( ) ) { JOptionPane . showMessageDialog ( JOptionUtils . centeringComp ( ) , e . getMessage ( ) ) ; } } } }
deletes all selected nodes in the workbench plus any edges that have had one of their nodes deleted in the process .
