Java Program to Implement Doubly Linked List

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A small prototype for a switch-lights problem (four or more consecutive lights will be turned off) By Henry Chen https://henry416.wordpress.com

Exception : Numbers of source Raster bands and source color space components do not match when read image

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JavaFX: Removing child from a Group causes Exception

Free

You can't directly modify a List while you're iterating though it. The iterator gets confused.
Do

List<Node> nodesToRemove = new ArrayList<>();
for(Node node : g.getChildren()){
    if(node instanceof Text){
        nodesToRemove.add(node);
    }
}

g.getChildren().removeAll(nodesToRemove);

or (I think):

for (Iterator<Node> iterator = g.getChildren().iterator(); iterator.hasNext();) {
    if (iterator.next() instanceof Text) {
        iterator.remove();
    }
}

or, in Java8,

g.getChildren().removeAll( g.getChildren().stream()
    .filter(node -> node instanceof Text)
    .collect(Collectors.toList()));

JavaFx Group

@DefaultProperty(value="children")
public class Group
extends Parent

• A Group node contains an ObservableList of children that are rendered in order whenever this node is rendered. A Group will take on the collective bounds of its children and is not directly resizable.

• Any transform, effect, or state applied to a Group will be applied to all children of that group. Such transforms and effects will NOT be included in this Group's layout bounds, however if transforms and effects are set directly on children of this Group, those will be included in this Group's layout bounds.

• By default, a Group will "auto-size" its managed resizable children to their preferred sizes during the layout pass to ensure that Regions and Controls are sized properly as their state changes. If an application needs to disable this auto-sizing behavior, then it should set autoSizeChildren to false and understand that if the preferred size of the children change, they will not automatically resize (so buyer beware!).

• Group Example:

    import javafx.scene.*;
    import javafx.scene.paint.*;
    import javafx.scene.shape.*;
    import java.lang.Math;

    Group g = new Group();
    for (int i = 0; i < 5; i++) {
       Rectangle r = new Rectangle();
        r.setY(i * 20);
        r.setWidth(100);
        r.setHeight(10);
        r.setFill(Color.RED);
        g.getChildren().add(r);
    }