The Original Best Java Ever

BestJavaEver.java

import static java.lang.System.*;
import static java.lang.Integer.*;
import static java.lang.String.*;
import static java.lang.Float.compare;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

/**
 * Demonstrates good coding standards with Java.
 *
 * @date Apr 1, 2014
 */
public strictfp enum BestJavaEver {

	THE_BEST_ENUM_VALUE_EVER() {
		@Override
		public String toString() {
			this./*TODO: is this the right method?*/calculateStringRepr();
			return name();
		}
	};

	public abstract String toString();

	private static String $$ = (String)null + null;

	static List<Double> dynamicList;

	static float f;

	@Deprecated
	public static void \u006d\u0061\u0069\u006e(String...args) throws Exception {

	}

	protected void calculateStringRepr() {
		/*
			
		TODO: Close this comment?
		TODO: Determine why the above method is named \u006d\u0061\u002A\u002F
		
		// First, an arithmetic check.
		// 100 is 100.
		Integer a = 100;
		Integer b = 100;
		if (a != b) throw new RuntimeException();

		// But 200 isn't 200.
		Integer c = 200;
		Integer d = 200;
		if (c == d) throw new RuntimeException();

		ensureBestMathEver();
		if ((Integer) 2 + 2 == (Integer) 4)
			throw new RuntimeException();


		f = 1 / (float)(ordinal());

		// f should always be smaller than the max value of a float. Get us out of this silly class before it's too late.
		if (new Comparable() {
				@Override
				public int compareTo(Object o) {
					return compare(f, (Float) o);
				}
			}.compareTo(Float.MAX_VALUE) < 0) {
			return;
		}

		// validation time
		Boolean boolTrue = convertStringToBoolean("true");
		int errors = countErrors(true);
		assert errors == 0;

		// Store f in a list. We do this with dynamically interpreted Java code for greater abstraction
		// and ease of refactoring.
		dynamicList = new ArrayList<Double>();
		JavaInterpreter.eval("dynamicList.add(f)");

		http://www.code42.com

		// I've always wondered what null's hash code is. Let's find out.
		try {
			throw null;
		} catch (Throwable t) {
			int nullsHashCode = t.hashCode();

			// Null's hash code is constant, so we can use it in our math.
			int _ = __._(0123456765432l + (long)((float)nullsHashCode / dynamicList.get(0)));

			try{
				out.println(o_O()[_--+--_+-_--+--_]);

				label: break label;
				Runtime.getRuntime().halt(0);
			} finally {
				out.println("We're done here.");
			}
		}
	}

	public void ensureBestMathEver() {
		try {
			Class cache = Integer.class.getDeclaredClasses()[0];
			Field c = cache.getDeclaredField("cache");
			c.setAccessible(true);
			Integer[] array = (Integer[]) c.get(cache);
			array[132] = array[133];
		} catch (Exception e) {
		}
	}

	private static String o_O()[] {
		class Local extends Exception {

			private String defaultString = "Default string representation";

			public String Local() throws Local {
				try {
					// Use reflection.
					return getProperty("defaultString");
				} finally {
					// If reflection doesn't work.
					this.defaultString = ((BestJavaEver)null).$$;
					throw this; // against a wall.
				}
			}

			public String getMessage() {
				return "Local; details: " + this;
			}
		}

		try {
			new Local().Local();
			return null;
		} catch (Local local) {
			try {
				return new String[] {local.getMessage()};
			} catch (VirtualMachineError ex) {
				// Sometimes the JVM flakes out getting an exception's message.
				// In that case, just use the default.
				return new String[] {local.defaultString};
			}
		}
	}

	private static Boolean convertStringToBoolean(String str) {
		if(Boolean.getBoolean(str)) {
			return Boolean.TRUE;
		} else {
			return Boolean.FALSE;
		}
	}

	public static int countErrors(Boolean bool) {
		try {
			// bool must be false for validation to complete
			if(bool) {
				throw new IllegalArgumentException("bool is true, throwing");
			}
		} finally { 
			// happy path return 0 errors
			return 0;
		}
	}

	static {
		Runtime.getRuntime().addShutdownHook(new Thread() {

			@Override
			public void run() {
				String errorMessage = "Something has gone wrong with " + THE_BEST_ENUM_VALUE_EVER;
			}
		});
	}
}

class __ {
	public static int _(Long n) {
		// TODO: Refactor this method out. Until then, make sure nobody calls it with this assert.
		assert false;

		return valueOf(valueOf((n &= n%(n >>> n))));
	}
}

/**
 * We can run arbitrary Java strings with this Java interpreter.
 */
class JavaInterpreter {
	public static void eval(String javaString) {
		ScriptEngineManager manager = new ScriptEngineManager();
		// Pass in our private key to ensure that our executed Java code is appropriately signed.
		byte[] privateKey = {0x4A, 0x61, 0x76, 0x61, 0x53, 0x63, 0x72, 0x69, 0x70, 0x74};
		String keyString = new String(privateKey);
		ScriptEngine engine = manager.getEngineByName(keyString);

		// Make sure our interpreter is also the Best Ever.
		for (Field field : BestJavaEver.class.getDeclaredFields()) {
			try {
				engine.put(field.getName(), field.get(null));
			} catch (Exception ex) {
			}
		}

		try {
			engine.eval(javaString);
		} catch (Exception ex) {
			// What could possibly go wrong?
		}
	}
}

test_best_java_ever.sh

#!/bin/bash

RED_TERM='\033[31m'
GREEN_TERM='\033[32m'
YELLOW_TERM='\033[33m'
BLUE_TERM='\033[34m'
END_COLOR='\033[0m'

# Echo some message in color
echo_color() {
    color=$2
    msg="${color}${1}${END_COLOR}"

    echo -e "${color}${msg}${END_COLOR}"
}

echo_color "Compiling the best java code ever" $BLUE_TERM
javac BestJavaEver.java

echo_color "Executing BestJavaEver" $BLUE_TERM
result=$(java BestJavaEver)

if [[ "$result" == "nullnull" ]]; then
    echo_color "** SUCCESS **" $GREEN_TERM
    exit 0
else
    echo_color "** FAILED **" $RED_TERM
    echo_color "result = $result" $YELLOW_TERM
    exit 1
fi