Does Raspberry Pi 4 can run Java program?

Yes! The Raspberry Pi 4 can run Java programs smoothly, thanks to its ARM-compatible JVM (Java Virtual Machine). Here’s how to set it up and run Java code on your Pi.

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1. Java Versions Supported on Raspberry Pi 4

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2. How to Install Java on Raspberry Pi 4

Method 1: Install OpenJDK (Recommended)

bash

sudo apt update
sudo apt install openjdk-11-jdk  # Default stable version
# OR for OpenJDK 17:
sudo apt install openjdk-17-jdk

Verify installation:

bash

java -version  # Should show "OpenJDK"

Method 2: Manual Oracle JDK Install (Advanced)

1. Download Oracle JDK for ARM64 from Oracle’s website.

2. Extract and set JAVA_HOME:

   bash

    tar -xzf jdk-17_linux-aarch64_bin.tar.gz
    sudo mv jdk-17 /opt/
    export JAVA_HOME=/opt/jdk-17
    export PATH=$PATH:$JAVA_HOME/bin
   

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3. Running a Java Program on Raspberry Pi 4

1. Write a simple Java program (HelloPi.java):

   java

    public class HelloPi {
        public static void main(String[] args) {
            System.out.println("Hello, Raspberry Pi 4!");
        }
    }
   

2. Compile & Run:

   bash

    javac HelloPi.java  # Compiles to HelloPi.class
    java HelloPi       # Runs the program
   

   Output:

   text

    Hello, Raspberry Pi 4!
   

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4. Performance Considerations

• RPi 4 (4GB/8GB) runs Java well for:

  • CLI apps, web servers (Spring Boot), IoT projects.

  • Lightweight GUI apps (JavaFX).

• Avoid:

  • Heavy JavaEE apps (limited RAM).

  • 3D games (weaker GPU vs. x86).

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5. Best Java Tools for Raspberry Pi

• VS Code (with Java Extension Pack).

• Eclipse (sudo apt install eclipse).

• Gradle/Maven for dependency management.

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6. Troubleshooting

• "Java not found"? → Reinstall OpenJDK.

• Slow performance? → Use OpenJDK 17 (faster than JDK 11).

• GUI apps not working? → Install openjfx for JavaFX support.

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Conclusion

✅ Yes, Raspberry Pi 4 runs Java efficiently with OpenJDK.
✅ Best for IoT, servers, and automation scripts.
❌ Not ideal for high-performance computing.