Java setup (easy)

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Questions and Answers

Which command can be used to check if Java is installed on a Windows PC?

java -version

java -v

java -check

java --version (correct)

Where can you download Java from?

Java.com

JDK-Downloads.com

Java SE – Downloads | Oracle Technology Network (correct)

Oracle.com

Which file format should be downloaded for Windows installation?

.rpm

.dmg

.tar.gz

.exe (correct)

Which file format should be downloaded for macOS installation?

.dmg Signup and view all the answers

What is the first step in Java installation?

Downloading the JDK Signup and view all the answers

Which command can be used to verify Java installation on a Windows PC?

java --version Signup and view all the answers

Which user can install the JDK on a Linux system?

Root user Signup and view all the answers

What should you do if the downloaded file size does not match the size mentioned on the site?

Try downloading the file again Signup and view all the answers

Which command can be used to check if Java is installed on a Linux system?

java -version Signup and view all the answers

Which command can be used to check if Java is installed on a macOS?

java --version Signup and view all the answers

Which of the following is the full form of IDE?

Integrated Development Environment Signup and view all the answers

What does an IDE do?

It makes typing and understanding code faster and easier Signup and view all the answers

Which IDE is commonly used for Java?

Eclipse Signup and view all the answers

What can you do if you face problems during IDE installation?

Refer to videos or install guide Signup and view all the answers

What is an alternative to using an IDE for writing codes?

Notebook Signup and view all the answers

What is the name of the first program you should write in Java?

Hello World Program Signup and view all the answers

How do you run a Java program in Eclipse?

Click on the run icon in the IDE Signup and view all the answers

How do you compile a Java program written in Notepad?

Open the terminal and type 'javac <filename>.java' Signup and view all the answers

What is the output of the Hello World program?

Hello World Signup and view all the answers

What will you learn in the next article?

Basics of Java programming Signup and view all the answers

Which step is necessary to set the JDK path in Windows?

Double click on the 'Path' under System Variables and add the copied path. Signup and view all the answers

Which command is used to install the JDK in Linux from a.tar.gz file?

$ tar zxvf jdk-13.interim.update.patch_linux-x64_bin.tar.gz Signup and view all the answers

Which command is used to install the JDK in Linux from a.rpm file?

$ rpm -ivh jdk-13.interim.update.patch_linux-x64_bin.rpm Signup and view all the answers

What is the purpose of the 'jdk/conf' folder in the Java installation?

To contain all the configuration files intended to be edited by developers, deployers, and end-users. Signup and view all the answers

What is the purpose of the 'jdk/lib' folder in the Java installation?

To contain private implementation details of the runtime system. Signup and view all the answers

What is the purpose of the 'jdk/jmods' folder in the Java installation?

To contain all the compiled module definitions. Signup and view all the answers

What is the purpose of the 'jdk/legal' folder in the Java installation?

To contain all the copyright and license files for each module. Signup and view all the answers

What is the purpose of the 'jdk/include' folder in the Java installation?

To contain the C-language header files that support native-code programming. Signup and view all the answers

What should you do after installing Java in macOS?

Delete the.dmg file to save disc space. Signup and view all the answers

Where should you write your Java program after installing Java?

In the JDK/bin folder. Signup and view all the answers

Study Notes

Java Installation on Windows

Use the command java -version to check if Java is installed on a Windows PC.
Download Java from the official Oracle website or OpenJDK.
The recommended file format for Windows installation is .exe.
The first step in Java installation is to run the downloaded installer.

Java Installation on macOS

The file format for macOS installation is .dmg.
Verify Java installation on a macOS system using the command java -version.

Java Installation on Linux

Any user with appropriate permissions can install the JDK on a Linux system.
Check if Java is installed on Linux using the command java -version.
For Linux installations, if the downloaded file size does not match the size mentioned on the site, re-download the file to avoid corruption.

Integrated Development Environment (IDE) for Java

IDE stands for Integrated Development Environment.
An IDE facilitates coding, debugging, and project management.
Eclipse is a commonly used IDE for Java development.
If problems arise during IDE installation, consult community forums or official documentation for troubleshooting tips.
Alternatively, code can be written using simple text editors like Notepad or command-line tools.

Java Programming Basics

The first program typically written in Java is "Hello World".
To run a Java program in Eclipse, create a new Java project, add the Java class, and then select Run from the menu.
Java programs written in Notepad can be compiled using the command javac FileName.java and run with java FileName.

Java Installation and Configuration

To set the JDK path in Windows, modify the system environment variables to include the path of the JDK bin directory.
Use the command tar -xvzf <file>.tar.gz to install the JDK in Linux from a .tar.gz file.
For installing from a .rpm file, use the command rpm -ivh <file>.rpm.

Java Installation Directory Structure

The jdk/conf folder contains configuration files for the JDK.
The jdk/lib folder holds libraries required by the Java runtime.
The jdk/jmods folder is used for Java modules.
The jdk/legal folder includes legal documents and licenses for the JDK.
The jdk/include folder contains header files for the Java native interface.

Post-Installation Steps

After installing Java on macOS, verify the installation with java -version.
Write Java programs in a suitable IDE or a text editor set up for Java development.

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Description

Test your knowledge on Java installation and programming with this quiz. Learn about the steps involved in downloading and verifying the JDK, and get ready to write your first Java program.