Free Sun Certified Java Programmer Basic Questions and Answers

Question 1

Only one of the five Component methods listed below is also a method of the class MenuItem. Which one?

Accepted Answer

setEnabled( boolean b )

Answer

The `setEnabled(boolean b)` method is a common method found in both the `Component` class and the `MenuItem` class. This method controls whether the component or menu item is active and can respond to user input. While other options like `setForeground`, `setVisible`, and `getSize` are `Component` methods, `MenuItem` specifically shares the `setEnabled` functionality.

Question 2

Which of the java.awt.Graphics class's following methods would be used to draw the outline of a rectangle in a single method call?

Accepted Answer

drawRect()

Answer

The `drawRect()` method of the `java.awt.Graphics` class is specifically designed to draw the outline of a rectangle using a single method call. Other methods like `fillPolygon()` and `drawPolygon()` are for drawing polygons, and `drawLine()` is for drawing individual line segments, not a complete rectangle outline.

Question 3

If comp is a __________, the Container methods add(Component comp) and add(String name, Component comp) will raise an IllegalArgumentException.

Accepted Answer

window

Answer

In AWT, `Window` objects (which include `Frame` and `Dialog`) are top-level containers and cannot be added to other `Container` objects using the `add()` methods. Attempting to add a `Window` to another `Container` will result in an `IllegalArgumentException` because `Window` objects are designed to be standalone and not nested within other components.

Question 4

Which one or ones of the following AWT classes are in charge of carrying out the components layout?

Accepted Answer

FlowLayout

Answer

`FlowLayout` and `GridBagLayout` are concrete layout manager classes in AWT that are responsible for arranging components within a container. `LayoutManager` is an interface that defines the contract for layout managers, not a class that performs layout itself. `WindowAdapter` is an adapter class for handling window events, unrelated to component layout.

Question 5

If a component needs to resize vertically but not horizontally, it should go in a:

Accepted Answer

BorderLayout in the East or West location

Answer

In a `BorderLayout`, components placed in the `EAST` or `WEST` regions will automatically resize vertically to fill the available height of the container. However, their horizontal width is typically fixed or determined by their preferred size, allowing them to resize vertically without changing horizontally. Components in `NORTH` or `SOUTH` resize horizontally, and `CENTER` resizes both ways.

SCJP - Sun Certified Java Programmer Practice Test

SCJP - Sun Certified Java Programmer Practice Test

Free Sun Certified Java Programmer Basic Questions and Answers