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+// This is my first java project with GitHub%0A%0Apublic class HelloWorld %7B%0A%0A%09/**%0A%09 * @param args%0A%09 */%0A%09public static void main(String%5B%5D args) %7B%0A%09%09System.out.println(%22Hello world!%22);%0A%09%7D%0A%0A%7D%0A

Create HelloWorld.java