| Title | Action | ||||
|---|---|---|---|---|---|
| 1 | Default int ValueWhat is the default value of an `int` instance variable in Java?... | easy | ○ Not Started | Variables | Solve |
| 2 | Inheritance KeywordWhich keyword is used to inherit a class in Java?... | easy | ○ Not Started | Classes | Solve |
| 5 | Array LengthWhat is the output of this code?... | easy | ○ Not Started | Arrays | Solve |
| 6 | Default ConstructorWhat happens if a class does not have an explicit constructor?... | easy | ○ Not Started | Classes | Solve |
| 7 | Random RangeWhat expression generates a random integer between 1 and 10 (inclusive)?... | easy | ○ Not Started | Methods | Solve |
| 26 | Multiple Prints Same LineWhat is the output of the following code?... | easy | ○ Not Started | Printing | Solve |
| 27 | Generic Type ParameterWhat does `<T>` represent in the class declaration `class Box<T> {}`?... | easy | ○ Not Started | Generics, Classes | Solve |
| 28 | Instantiating a Generic ClassGiven the generic class below, which line correctly creates a Box that holds a S... | easy | ○ Not Started | Generics, Classes | Solve |
| 29 | Valid Generic Method SignatureWhich of the following is a correctly declared generic method signature in Java?... | easy | ○ Not Started | Generics, Methods | Solve |
| 30 | Generic Class OutputWhat does this code print?... | easy | ○ Not Started | Generics, Classes | Solve |
| 37 | JavaFX StageIn JavaFX, what does a `Stage` represent?... | easy | ○ Not Started | JavaFX | Solve |
| 38 | JavaFX Entry PointWhich method must you override to launch a JavaFX application?... | easy | ○ Not Started | JavaFX | Solve |
| 39 | Button Click HandlerWhat happens when the user clicks the button in this code?... | easy | ○ Not Started | JavaFX | Solve |
| 40 | VBox Layout DirectionHow does a `VBox` arrange its children in JavaFX?... | easy | ○ Not Started | JavaFX | Solve |
| 41 | TextField InputA user types "Hello" into a `TextField`. What does `textField.getText()` return?... | easy | ○ Not Started | JavaFX | Solve |
| 42 | Event Handler PurposeWhat does the `setOnAction()` method do on a JavaFX `Button`?... | easy | ○ Not Started | JavaFX | Solve |
| 43 | Scene in JavaFXWhat is the role of a `Scene` in a JavaFX application?... | easy | ○ Not Started | JavaFX | Solve |
| 44 | Reading a Scene GraphWhat does this code display in the window?... | easy | ○ Not Started | JavaFX | Solve |
| 45 | Window Not AppearingThis JavaFX app compiles and runs but no window appears. What is the bug?... | easy | ○ Not Started | JavaFX | Solve |
| 46 | Inline CSS StylingWhat does this line of code do?... | easy | ○ Not Started | JavaFX | Solve |
| 57 | HBox LayoutWhat does this code produce?... | easy | ○ Not Started | JavaFX | Solve |
| 58 | Prompt TextWhat does `setPromptText()` do on a `TextField`?... | easy | ○ Not Started | JavaFX | Solve |
| 59 | CheckBox StateWhat does this code print when the user checks the box?... | easy | ○ Not Started | JavaFX | Solve |
| 60 | Padding with InsetsWhat does `setPadding()` do in this code?... | easy | ○ Not Started | JavaFX | Solve |
| 61 | StackPane LayersHow does a `StackPane` arrange its children?... | easy | ○ Not Started | JavaFX | Solve |
| 3 | Loop OutputWhat is the output of this code?... | medium | ○ Not Started | Loops | Solve |
| 4 | String ComparisonWhat is the output of this code?... | medium | ○ Not Started | Strings | Solve |
| 8 | Switch to If ElseWhich if-else statement is equivalent to the given switch statement?... | medium | ○ Not Started | Conditionals | Solve |
| 9 | Count Zeros MethodWhat does this method return when called with countZeros({1, 0, 2, 0, 3})?... | medium | ○ Not Started | Arrays | Solve |
| 10 | Sign Method OutputWhat does this method return when called with getSign(-5)?... | medium | ○ Not Started | Methods | Solve |
| 11 | Array Length vs String LengthWhat is the difference between using `.length` for arrays and `.length()` for st... | medium | ○ Not Started | Strings | Solve |
| 12 | Base Case for PowerWhich is the correct base case for a recursive power function power(base, expone... | medium | ○ Not Started | Methods | Solve |
| 13 | Sphere VolumeA Sphere class has a constructor that takes a radius. What should the volume() m... | medium | ○ Not Started | Classes | Solve |
| 14 | Count Letter AWhat does this code output?... | medium | ○ Not Started | Loops | Solve |
| 16 | next vs nextLineWhen the input is just `hello` on one line (nothing after it), what will be prin... | medium | ○ Not Started | Scanner | Solve |
| 17 | Random Integer RangeWhich line generates an integer from 30 to 45 inclusive using `rng`?... | medium | ○ Not Started | Methods | Solve |
| 18 | String ImmutabilityWhat is printed?... | medium | ○ Not Started | Strings | Solve |
| 19 | Array AliasingWhat is printed?... | medium | ○ Not Started | Arrays | Solve |
| 20 | Loop TotalWhat is the final value of `sum` after the loop finishes?... | medium | ○ Not Started | Loops | Solve |
| 21 | Switch Fall ThroughWhat is printed when `x` is 2?... | medium | ○ Not Started | Conditionals | Solve |
| 22 | Method Overloading PickWhich method is called by `printValue(5)`?... | medium | ○ Not Started | Methods | Solve |
| 23 | Constructor and FieldsWhat is printed?... | medium | ○ Not Started | Classes | Solve |
| 24 | Enhanced For Loop ChangeWhat is printed?... | medium | ○ Not Started | Arrays | Solve |
| 25 | Integer Division ResultWhat is printed?... | medium | ○ Not Started | Methods | Solve |
| 31 | Bounded Type ParameterWhat does the type constraint `<T extends Number>` mean when used as a generic t... | medium | ○ Not Started | Generics, Classes | Solve |
| 32 | Generic Max MethodWhat does this generic method return when called as `max(3, 7)`?... | medium | ○ Not Started | Generics, Methods | Solve |
| 33 | Multiple Type ParametersWhich declaration correctly defines a generic class with two independent type pa... | medium | ○ Not Started | Generics, Classes | Solve |
| 34 | Upper Bounded WildcardWhich statement about a parameter typed as `List<? extends Number>` is true?... | medium | ○ Not Started | Generics, Methods | Solve |
| 35 | Generic Method Type InferenceWhat does this code print?... | medium | ○ Not Started | Generics, Methods | Solve |
| 47 | Counter Button LogicWhat happens each time the button is clicked?... | medium | ○ Not Started | JavaFX | Solve |
| 48 | Node in Two ParentsWhat happens when this code runs?... | medium | ○ Not Started | JavaFX | Solve |
| 49 | BorderPane LayoutWhat layout does this code produce?... | medium | ○ Not Started | JavaFX | Solve |
| 50 | GridPane Cell PositionWhere does the `Button` appear in the grid?... | medium | ○ Not Started | JavaFX | Solve |
| 51 | Background Thread UI UpdateThis code throws an `IllegalStateException` at runtime. What is the issue?... | medium | ○ Not Started | JavaFX | Solve |
| 52 | Property BindingWhat does this property binding do?... | medium | ○ Not Started | JavaFX | Solve |
| 53 | RadioButton ToggleGroupWhat does the `ToggleGroup` do in this code?... | medium | ○ Not Started | JavaFX | Solve |
| 54 | Missing ChildrenThe window appears but is completely blank. What is the bug?... | medium | ○ Not Started | JavaFX | Solve |
| 55 | ComboBox SelectionWhat does this code do when the user selects a color from the dropdown?... | medium | ○ Not Started | JavaFX | Solve |
| 56 | ObservableList and ListViewAfter the "Add" button is clicked once, then the "Remove" button is clicked once... | medium | ○ Not Started | JavaFX | Solve |
| 62 | Scene SwitchingWhat happens when the "Go to Page 2" button is clicked?... | medium | ○ Not Started | JavaFX | Solve |
| 63 | VBox AlignmentWhere do the children appear in the window?... | medium | ○ Not Started | JavaFX | Solve |
| 64 | Alert DialogWhat does this code do when the button is clicked?... | medium | ○ Not Started | JavaFX | Solve |
| 65 | KeyEvent HandlerWhat does this code do?... | medium | ○ Not Started | JavaFX | Solve |
| 66 | FXML Controller WiringWhat does the `@FXML` annotation do in a JavaFX controller class?... | medium | ○ Not Started | JavaFX | Solve |
| 15 | Evenly DivisibleWhat does this method return for isEvenlyDivisible(20, 7)?... | hard | ○ Not Started | Methods | Solve |
| 36 | Raw Type and ClassCastExceptionThis code compiles (with an unchecked warning suppressed). What happens when it ... | hard | ○ Not Started | Generics, Classes | Solve |