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Questions and Answers
After installing the JDK on Windows, what is the primary reason for setting the 'Path' environment variable?
After installing the JDK on Windows, what is the primary reason for setting the 'Path' environment variable?
- To configure the default memory allocation for Java applications.
- To define the location where Java runtime environment (JRE) should store temporary files.
- To specify the location of the Java source code files.
- To enable the operating system to locate the Java executables (like `java.exe` and `javac.exe`) from any command prompt location. (correct)
When setting the CLASSPATH environment variable, what does the value .; signify?
When setting the CLASSPATH environment variable, what does the value .; signify?
- It specifies the current directory as the only location to find class files and includes external libraries. (correct)
- It indicates that no class files should be loaded.
- It sets the classpath to the default system classpath.
- It tells the Java compiler to ignore all classpaths.
A user installs the Java Development Kit (JDK) but forgets to set the Path environment variable. What is the most likely symptom they will experience?
A user installs the Java Development Kit (JDK) but forgets to set the Path environment variable. What is the most likely symptom they will experience?
- Java programs will compile, but not execute.
- The system will be unable to locate Java runtime environment.
- The user will be unable to run `javac` or `java` commands from the command line without navigating to the JDK's \bin directory. (correct)
- Java programs will execute, but not compile.
Which of the following is the correct procedure to access the environment variables on a Windows system after installing Java?
Which of the following is the correct procedure to access the environment variables on a Windows system after installing Java?
A user has both JDK 17 and JDK 23 installed on their Windows machine. After setting the Path environment variable to point to JDK 23, they still encounter issues running applications that require JDK 17. What is the most probable cause?
A user has both JDK 17 and JDK 23 installed on their Windows machine. After setting the Path environment variable to point to JDK 23, they still encounter issues running applications that require JDK 17. What is the most probable cause?
Which of the following accurately describes the hierarchical structure within a Java program?
Which of the following accurately describes the hierarchical structure within a Java program?
What is the primary purpose of comments within a Java program?
What is the primary purpose of comments within a Java program?
Which line of code represents a properly formatted single-line comment in Java?
Which line of code represents a properly formatted single-line comment in Java?
Why is Java considered to be case-sensitive?
Why is Java considered to be case-sensitive?
Which of the following is NOT a valid identifier in Java?
Which of the following is NOT a valid identifier in Java?
What role does white space play in a Java program?
What role does white space play in a Java program?
Given the command java in the command prompt returns 'command not found', what does this typically indicate?
Given the command java in the command prompt returns 'command not found', what does this typically indicate?
Which of the following statements accurately describes reserved words in Java?
Which of the following statements accurately describes reserved words in Java?
In Java, what is the significance of the main method?
In Java, what is the significance of the main method?
Which set of keywords always precedes the main method in a standard Java application?
Which set of keywords always precedes the main method in a standard Java application?
Flashcards
What is the Java installation path?
What is the Java installation path?
The directory where Java is installed, needed for your computer to find Java programs.
How to set the 'Path' for Java?
How to set the 'Path' for Java?
Navigate to 'Edit the System Environment', then 'Environment Variables', find 'Path', and add the Java 'bin' directory.
What path do I add to the 'Path' variable?
What path do I add to the 'Path' variable?
Add 'C:\Program Files\Java\jdk-23\bin' to the 'Path' environment variable so your system can execute Java commands.
What is the 'CLASSPATH' variable?
What is the 'CLASSPATH' variable?
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What value should I give to the 'CLASSPATH'?
What value should I give to the 'CLASSPATH'?
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Programming Language
Programming Language
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Object-Oriented Language
Object-Oriented Language
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Class
Class
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Method
Method
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Main Method
Main Method
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Comments
Comments
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Identifiers
Identifiers
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Case sensitive
Case sensitive
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Reserved Words
Reserved Words
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White Space
White Space
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Study Notes
- Installing Java for Windows:
- Save the file to the desktop and run it.
- Java will be installed to C:\Program Files\Java\jdk-23.
- It is necessary to set the computer's path for Java to work correctly.
Setting the Path
- Go to Edit the System Environment under Advanced Environment Variables.
- Click "Path", then Edit, then New.
- Add the following to the end of the path: C:\Program Files\Java\jdk-23\bin.
- Click OK.
- Create a new variable with the name CLASSPATH and the value .;
- Click OK and exit all open windows.
Testing the Java Installation
- Open a command prompt.
- Click on Start and then Run, type cmd.exe, and click Ok.
- Type java and hit enter.
- If "command not found" appears, Java installation was not successful.
- Receiving a list of options for running Java indicates a successful installation.
Java Programming Language
- Specifies the words and symbols for writing programs.
- Employs a set of rules for combining words and symbols to form valid program statements.
- Created by Sun Microsystems, Inc, later acquired by Oracle.
- Introduced in 1995 and has become popular as an object-oriented language.
Java Program Structure
- A program consists of one or more classes.
- A class contains one or more methods.
- A method contains program statements.
- A Java application always contains a method called main.
First Java program
- Demonstrates the basic structure of a Java application.
- Shows comments and class definition.
Simple Java Program
- Prints two sentences, including a quote by Abraham Lincoln.
Dissecting the first Java program
- All Java applications begin with a class definition like public class Lincoln.
- The main method has processing, and is preceded by public, static, and void.
- The println method prints a character string to the screen enclosed in double quotes.
Comments
- Also called inline documentation.
- Explain the purpose of processing steps.
- Do not affect how the proram works.
- Examples:
- // this comment runs to the end of the line
- /* this comment runs to the terminating symbol, even across line breaks */
Identifiers
- Words a programmer chooses in a program.
- Made up of letters, digits, underscore (_), and dollar sign ($) but cannot begin with a digit.
- Java is case sensitive.
- Include user-defined identifiers and reserved words that have predefined meanings.
- Reserved words cannot be used in any other way.
White Space
- Spaces, blank lines, and tabs.
- Used to separate words and symbols.
- Extra spaces will be ignored.
- Format programs for readability using consistent indentation.
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