How to Download rt.jar JDK 1.8 Source Code
If you are a Java developer, you might have wondered what is inside the mysterious rt.jar file that is part of every Java installation. In this article, we will explain what is rt.jar, why it is useful, and how to download its source code from different sources.
download rt jar for jdk 1.8 source code
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What is rt.jar?
rt.jar stands for runtime jar and contains the compiled class files for the base Java Runtime Environment (JRE). The JRE is an implementation of the Java platform that provides the core functionality of Java, such as basic types, input/output, networking, security, reflection, concurrency, etc. The JRE also includes a Java Virtual Machine (JVM) that executes Java bytecode.
Why do we need rt.jar?
rt.jar provides the essential classes that are required to run any Java application. Without rt.jar, you would not be able to use any of the standard Java APIs or libraries. For example, if you want to create a String object, you need to import the java.lang package, which is part of rt.jar. Similarly, if you want to use a Scanner object to read user input, you need to import the java.util package, which is also part of rt.jar.
Where is rt.jar located?
rt.jar is usually found in the jre/lib directory of the JDK or JRE installation. For example, if you have installed JDK 1.8 on Windows, you can find rt.jar in the following path:
C:\Program Files\Java\jdk1.8.0_301\jre\lib\rt.jar
You can also use the java.home system property to get the location of the JRE installation programmatically. For example, you can run the following code to print the path of rt.jar:
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System.out.println(System.getProperty("java.home") + "\\lib\\rt.jar");
How to Download rt.jar JDK 1.8 Source Code from Oracle?
If you want to download the source code of rt.jar for JDK 1.8 from Oracle, you can follow these steps:
Step 1: Go to Oracle's website and select the JDK version
First, you need to go to Oracle's website and select the JDK version that you want to download. You can use this link to access the download page:
You will see a list of JDK downloads for different platforms and architectures. Choose the one that matches your system and click on the download link. For example, if you are using Windows x64, you can click on this link:
Step 2: Accept the license agreement and download the JDK source code
Before you can download the JDK source code, you need to accept the license agreement. You will see a checkbox that says "Accept License Agreement". Check it and then click on the download link again. You will see a dialog box that asks you to save the file. Choose a location where you want to save the file and click on "Save". The file size is about 200 MB, so it may take some time to download depending on your internet speed.
The following screenshot shows how the license agreement and the download link look like:
Step 3: Extract the src.zip file and locate the rt.jar source code
After you have downloaded the JDK source code, you need to extract it. You can use any tool that can extract zip files, such as WinZip, WinRAR, or 7-Zip. Right-click on the file and choose "Extract All" or "Extract Here". You will see a folder named "jdk1.8.0_301" or something similar.
Inside this folder, you will find another folder named "src.zip". This is the file that contains the source code of rt.jar. You need to extract this file as well. Right-click on it and choose "Extract All" or "Extract Here". You will see a folder named "src" that contains many subfolders and files.
The following screenshot shows how the src.zip file and its contents look like:
The source code of rt.jar is located in the subfolder named "java". This subfolder contains many packages that correspond to the Java APIs and libraries. For example, if you want to see the source code of the String class, you can go to this path:
src\java\lang\String.java
You can open any of these files in an IDE or a text editor and browse through them. 44f88ac181
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