Defusing the bomb: https://www.reddit.com/r/dailyprogrammer/comments/5e4mde/20161121_challenge_293_easy_defusing_the_bomb

DefuseBomb.java

import java.util.function.Predicate;
import java.util.HashMap;

public class DefuseBomb {
	private HashMap<Wire, Predicate<Wire>> explosiveWireCutSequences =
		new HashMap<Wire, Predicate<Wire>>();
	private enum Wire { white, black, purple, red, green, orange };

	public DefuseBomb(String[] wireCuts) {
		setExplosiveWireCutSequences();
		defuseBomb(wireCuts);
	}

	public static void main(String[] args) {
		String[] wireCuts = args;
		new DefuseBomb(wireCuts);
	}

	private boolean areValidWires(String[] wireCuts) {
		if (wireCuts == null || wireCuts.length < 1)
			return false;

		for (String wireCut : wireCuts)
			try {
				Wire.valueOf(wireCut);
			} catch(IllegalArgumentException ex) {
				return false;
			}

		return true;
	}

	private void defuseBomb(String[] wireCuts) {
		if (!areValidWires(wireCuts)) {
			System.out.println("Illegal input");
			return;
		}

		if (hasExplosiveSequence(wireCuts))
			System.out.println("Boom");
		else
			System.out.println("Bomb defused");
	}

	private boolean hasExplosiveSequence(String[] wireCuts) {
		for (int i=0; i<wireCuts.length-1; i++) {
			Wire wire = Wire.valueOf(wireCuts[i]);
			Wire nextWire = Wire.valueOf(wireCuts[i+1]);

			if (explosiveWireCutSequences.get(wire).test(nextWire))
				return true;
		}
		return false;
	}

	private void setExplosiveWireCutSequences() {
		explosiveWireCutSequences.put(
			Wire.white,
			next->	next.equals(Wire.white) ||
					next.equals(Wire.black)
			);
		explosiveWireCutSequences.put(
			Wire.black,
			next->	next.equals(Wire.white) ||
					next.equals(Wire.green) ||
					next.equals(Wire.orange)
			);
		explosiveWireCutSequences.put(
			Wire.purple,
			next->	next.equals(Wire.white) ||
					next.equals(Wire.purple) ||
					next.equals(Wire.green) ||
					next.equals(Wire.orange)
			);
		explosiveWireCutSequences.put(
			Wire.red,
			next->	next.equals(Wire.white) ||
					next.equals(Wire.black) ||
					next.equals(Wire.purple) ||
					next.equals(Wire.red) ||
					next.equals(Wire.orange)
			);
		explosiveWireCutSequences.put(
			Wire.green,
			next->	next.equals(Wire.black) ||
					next.equals(Wire.purple) ||
					next.equals(Wire.red) ||
					next.equals(Wire.green)
			);
		explosiveWireCutSequences.put(
			Wire.orange,
			next->	next.equals(Wire.white) ||
					next.equals(Wire.purple) ||
					next.equals(Wire.green) ||
					next.equals(Wire.orange)
			);
	}
}