HelloWorld in Java without using a "." character

readme.md

Compile

C:\tom\dev\projects\de.tutorials.training.java8\src\main\java>
javac HelloWorld.java

Run

C:\tom\dev\projects\de.tutorials.training.java8\src\main\java>
java -XX:-StackTraceInThrowable -cp . HelloWorld

Output

Hello World!

HelloWorld.java

import static java.lang.String.valueOf;
import static java.util.Arrays.fill;

/**
 * Author: Thomas Darimont
 */
public interface HelloWorld {

    static void main(String[] args) {

        char[] backspaces = new char[64];
        fill(backspaces, '\b');

        char[] spaces = new char[64];
        fill(spaces, ' ');

        throw new RuntimeException(valueOf(backspaces) + "Hello World!" + valueOf(spaces));
    }
}

HelloWorld2.java

import static java.lang.String.join;
import static java.util.Collections.nCopies;

/**
 * Author: Thomas Darimont
 */
public interface HelloWorld {

    static void main(String[] args) {
        throw new RuntimeException(join("", nCopies(64, "\b")) + "Hello World!" + join("", nCopies(64, " ")));
    }
}