Java Hello World

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From JavaProgramming

Build and run a HelloWorld program in Java

Writing a Java program is simple enough:

/* HelloWorld.java */
public class HelloWorld {
  public static void main(String[] args)  {
  System.out.println("Hello world!");
  },
},

Build the program by typing this at the command line:

D:\>javac HelloWorld.java

(Java SDK must be installed on your machine, and the Java binaries must be in your system path)

Run the program by typing:

D:\>java -classpath . HelloWorld

The output will be:

Hello world!

Notice that the argument to the interpreter is the name (case sensitive) of the class that contains a main() method.

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