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sudo apt install openjdk-11-jdk

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java -version

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import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) {
        String message;
        message = "Input your name";
        System.out.println(message);
        Scanner in = new Scanner(System.in);
        String inputText = in.nextLine();
        System.out.println("Hello " + inputText);
        in.close();
    }
}

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javac HelloWorld.java

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java HelloWorld