Podcast
Questions and Answers
What is the term used to describe an error causing a program to take an action that the programmer did not intend?
What is the term used to describe an error causing a program to take an action that the programmer did not intend?
A __________ contains sequences of programming instructions that describe how to perform a particular task.
A __________ contains sequences of programming instructions that describe how to perform a particular task.
method
What is a logic error?
What is a logic error?
A program that is syntactically correct but does not do what it is supposed to do.
What is the name of the file generated by the Java compiler?
What is the name of the file generated by the Java compiler?
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A(n) __________ is a software package that provides an editor, a compiler, and other programming tools.
A(n) __________ is a software package that provides an editor, a compiler, and other programming tools.
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In a flowchart, the __________ is used to represent processing.
In a flowchart, the __________ is used to represent processing.
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Given the public class name GroceryStore and filename grocerystore.java, which statement is correct?
Given the public class name GroceryStore and filename grocerystore.java, which statement is correct?
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Java source code files end with file extension __________.
Java source code files end with file extension __________.
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Is an installation program required for Eclipse, or can it be extracted from a zip file?
Is an installation program required for Eclipse, or can it be extracted from a zip file?
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What console command is used to display the version of the Java runtime environment installed?
What console command is used to display the version of the Java runtime environment installed?
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What is the output of the following code: int num1 = 6; int num2 = 10; num1 = num2; num2 = num1; System.out.println(num1 + ',' + num2);
What is the output of the following code: int num1 = 6; int num2 = 10; num1 = num2; num2 = num1; System.out.println(num1 + ',' + num2);
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Which line of code correctly uses the assignment operator, given: int total;
Which line of code correctly uses the assignment operator, given: int total;
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Which of the following identifiers will compile in Java?
Which of the following identifiers will compile in Java?
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Which line of code correctly uses a method, given: int myNumber;
Which line of code correctly uses a method, given: int myNumber;
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If the values of 2.5 and "Hello" were sent in that specific order to a method, which method would be used?
If the values of 2.5 and "Hello" were sent in that specific order to a method, which method would be used?
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What is assigned to the variable associated with an object of type Car created in the main() method?
What is assigned to the variable associated with an object of type Car created in the main() method?
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What Java package provides classes that are used in all Java programs?
What Java package provides classes that are used in all Java programs?
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Which of the following is not a way to create a breakpoint in Eclipse?
Which of the following is not a way to create a breakpoint in Eclipse?
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When debugging in Eclipse to end the debugging session immediately we can use the __________ button.
When debugging in Eclipse to end the debugging session immediately we can use the __________ button.
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Which debugging in Eclipse command is most commonly used to follow program execution line-by-line?
Which debugging in Eclipse command is most commonly used to follow program execution line-by-line?
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The access specifier in the declaration of instance variables should be __________.
The access specifier in the declaration of instance variables should be __________.
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Study Notes
Common Programming Errors
- Run-time Error: An error that causes a program to take an unintended action.
- Logic Error: A program that is written correctly but does not function as expected.
Java Programming Basics
- Method: Sequences of programming instructions that perform a specific task.
- IDE (Integrated Development Environment): A software package providing tools like editors, compilers, and debuggers.
- Flowcharts: Use parallelograms to represent processing.
- Java Source Code Files: End with the file extension "java".
- Java Compilation: Compiles into a "class" file.
- Java Version Check: Use the command "java -version" to display the version.
- File Naming Conventions: The public class name must match the filename, even in capitalization.
Java Syntax and Data Types
- Variables: Hold data values.
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Assignment Operator ("="): Sets a variable to a value. Example:
total = 1 + 3 - Identifiers: Names given to variables, methods, and classes.
- Valid Identifiers: Must start with a letter or underscore, and can contain letters, digits, and underscores.
Calling Methods and Parameters
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Method Calls: Use the method name followed by parentheses. Example:
System.out.println. - Parameters: Values passed to methods to modify their behavior.
Objects and Classes
- Objects: Encapsulate data and methods.
- Creating Objects: Use the "new" keyword.
- Object References: Variables hold references to objects.
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Java Packages: Provide classes for common functionality:
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java.lang: Provides core classes used in all Java programs. -
java.util: Contains classes like arrays, maps, and lists.
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Debugging in Eclipse
- Breakpoints: Pause program execution at specific lines.
- Toggle Breakpoint: Add or remove breakpoints in Eclipse.
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Debugging Commands:
- Step Into: Execute a line of code within a method.
- Step Over: Execute a line of code, skipping any method calls.
- Step Return: Execute a line of code, returning from a method.
- Terminate: End the debugging session.
Access Modifiers
- Private: Access restricted to the class itself.
- Public: Access allowed from any location.
- Protected: Access for the class, subclasses, and packages.
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Description
This quiz covers essential concepts in Java programming, including common programming errors such as run-time and logic errors. It also delves into the basics of Java, including methods, IDEs, flowcharts, and syntax. Test your knowledge on Java's foundational elements and its error handling!
