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Questions and Answers
Within an implementation of the itemStateChanged() method, you can use the ___ method to determine which object generated the event and the getStateChange() method to determine whether the event was a selection or a deselection.
Within an implementation of the itemStateChanged() method, you can use the ___ method to determine which object generated the event and the getStateChange() method to determine whether the event was a selection or a deselection.
InputStream is a child of FileInputStream.
InputStream is a child of FileInputStream.
False
A class diagram consists of a rectangle divided into three sections.
A class diagram consists of a rectangle divided into three sections.
True
The methods in a subclass can use all of the data fields and methods that belong to its parent, with one exception: Members of the parent class are not accessible within a child class's methods.
The methods in a subclass can use all of the data fields and methods that belong to its parent, with one exception: Members of the parent class are not accessible within a child class's methods.
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The JMenus are added to the JMenuBar using the ___ method.
The JMenus are added to the JMenuBar using the ___ method.
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You can create a writable file by using the Path class ___ method?
You can create a writable file by using the Path class ___ method?
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Unplanned exceptions that occur during a program's execution are also called execution exceptions.
Unplanned exceptions that occur during a program's execution are also called execution exceptions.
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A good toString() method can be very useful in debugging a program.
A good toString() method can be very useful in debugging a program.
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When an exception is a checked exception, client programmers are forced to deal with the possibility that an exception will be thrown.
When an exception is a checked exception, client programmers are forced to deal with the possibility that an exception will be thrown.
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Match each term with the correct statement below:
Match each term with the correct statement below:
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In most Java classes, the keyword private precedes each data field, and the keyword ___ precedes each method.
In most Java classes, the keyword private precedes each data field, and the keyword ___ precedes each method.
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The Swing classes are part of a more general set of UI programming capabilities that are collectively called the ___.
The Swing classes are part of a more general set of UI programming capabilities that are collectively called the ___.
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When components in a Swing UI require more display area than they have been allocated, you can use a ___ container to hold the components and allow the user to display the components using scrollbars.
When components in a Swing UI require more display area than they have been allocated, you can use a ___ container to hold the components and allow the user to display the components using scrollbars.
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Random files are also called ___ files.
Random files are also called ___ files.
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The Java compiler does not require that you catch or specify ___ exceptions.
The Java compiler does not require that you catch or specify ___ exceptions.
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An array of bytes can be wrapped, or encompassed, into a ByteBuffer using the ByteBuffer ___ method.
An array of bytes can be wrapped, or encompassed, into a ByteBuffer using the ByteBuffer ___ method.
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When you use a(n) ___ statement, you state a condition that should be true, and Java throws an AssertionError when it is not.
When you use a(n) ___ statement, you state a condition that should be true, and Java throws an AssertionError when it is not.
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In a(n) ___ program, the user might initiate any number of events in any order.
In a(n) ___ program, the user might initiate any number of events in any order.
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The value you store in memory is lost when the program ends or the computer loses power. This type of storage is ___.
The value you store in memory is lost when the program ends or the computer loses power. This type of storage is ___.
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The first step in drawing a 2D object is to specify how a drawn object is rendered.
The first step in drawing a 2D object is to specify how a drawn object is rendered.
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___ polymorphism is the ability of one method name to work appropriately for different subclass objects of the same parent class.
___ polymorphism is the ability of one method name to work appropriately for different subclass objects of the same parent class.
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If you provide an empty method within an abstract class, the method is an abstract method even if you do not explicitly use the keyword ___ when defining the method.
If you provide an empty method within an abstract class, the method is an abstract method even if you do not explicitly use the keyword ___ when defining the method.
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An additional layered pane exists above the root pane, but it is not often used explicitly by Java programmers.
An additional layered pane exists above the root pane, but it is not often used explicitly by Java programmers.
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You use the ___ method in statements to add points to a polygon.
You use the ___ method in statements to add points to a polygon.
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The Object class contains a(n) ___ method that takes a single argument, which must be the same type as the type of the invoking object.
The Object class contains a(n) ___ method that takes a single argument, which must be the same type as the type of the invoking object.
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The ___ responds to keyboard focus events.
The ___ responds to keyboard focus events.
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A data file is used as a(n) ___ file when each record is stored in order based on the value in some field.
A data file is used as a(n) ___ file when each record is stored in order based on the value in some field.
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Swing components are UI elements such as dialog boxes and buttons; you can usually recognize their names because they begin with the letter ___.
Swing components are UI elements such as dialog boxes and buttons; you can usually recognize their names because they begin with the letter ___.
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Any of the file input or output methods in a Java program might throw an exception, so all the relevant code in the class is placed in a ___ block.
Any of the file input or output methods in a Java program might throw an exception, so all the relevant code in the class is placed in a ___ block.
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To create your own throwable Exception, you must extend a subclass of ___.
To create your own throwable Exception, you must extend a subclass of ___.
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The capability to inherit from more than one class is called ___.
The capability to inherit from more than one class is called ___.
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Study Notes
Java Programming Concepts
- The
getItem()method is used within theitemStateChanged()method to determine the object that generated the event. -
InputStreamis not a child ofFileInputStream. - A class diagram is represented by a rectangle divided into three sections.
- Private members of the parent class are not accessible within a child class's methods.
- The
add()method is used to addJMenus to aJMenuBar. - The
newOutputStream()method from thePathclass is used to create a writeable file. - Unplanned exceptions that occur during a program's execution are known as runtime exceptions.
- A well-written
toString()method can be helpful for debugging a program. - When an exception is a checked exception, developers must handle the possibility of the exception being thrown.
Java Graphics
- The
fillPolygon()method is used to create polygons. - An acyclic gradient does not cycle between colors.
- The 3D method works best with lighter drawing colors.
- The
descentvalue measures the part of characters that extend below the baseline. - The
Line2D.Floatclass is used to create lines. - A fill pattern controls how a drawn object is filled in.
- The
getScreenResolution()method returns the number of pixels as an integer.
Java Programming Techniques
- The
publickeyword precedes methods in most Java classes. - Swing classes are part of the Java Foundation Classes (JFC).
- The
JScrollPanecontainer is used to hold components and allow scrolling. - Random files are also known as instant access files.
- Runtime exceptions do not need to be caught or specified by the Java compiler.
- The
wrap()method in theByteBufferclass is used to encompass an array of bytes. - An
assertstatement checks a condition that is expected to be true; if it's not, anAssertionErroris thrown. - In an event-driven program, user actions trigger events in any order.
- Temporal storage refers to data that is lost when the program ends or the computer loses power.
- Specifying how a drawn object is rendered is the first step in drawing a 2D object.
- Subtype polymorphism allows a single method name to work with different subclass objects of the same parent class.
- Even without explicitly using the
abstractkeyword, methods in an abstract class are considered abstract if they are empty. - An additional layered pane above the root pane exists but isn't often used explicitly by Java programmers.
- The
addPoint()method is used to add points to a polygon. - The
equals()method in theObjectclass takes a single argument of the same type as the invoking object. - The
FocusListenerresponds to keyboard focus events. - A sequential access file stores records in order based on a field's value.
- Swing components have names that typically start with the letter
J. - A
tryblock encloses code that may throw an exception. - To create a custom throwable
Exception, extend a subclass ofThrowable. - Multiple inheritance allows a class to inherit from more than one class.
- The ...
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Description
Test your knowledge on key Java programming concepts such as event handling, exception management, and class diagrams. Additionally, explore Java graphics techniques including polygon creation and color gradients. This quiz covers essential aspects of Java for aspiring developers.
