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Task/Move-to-front-algorithm/Java/move-to-front-algorithm.java

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+import java.util.LinkedList;
+import java.util.List;
+
+public class MTF{
+	public static List<Integer> encode(String msg, String symTable){
+		List<Integer> output = new LinkedList<Integer>();
+		StringBuilder s = new StringBuilder(symTable);
+		for(char c : msg.toCharArray()){
+			int idx = s.indexOf("" + c);
+			output.add(idx);
+			s = s.deleteCharAt(idx).insert(0, c);
+		}
+		return output;
+	}
+	
+	public static String decode(List<Integer> idxs, String symTable){
+		StringBuilder output = new StringBuilder();
+		StringBuilder s = new StringBuilder(symTable);
+		for(int idx : idxs){
+			char c = s.charAt(idx);
+			output = output.append(c);
+			s = s.deleteCharAt(idx).insert(0, c);
+		}
+		return output.toString();
+	}
+	
+	private static void test(String toEncode, String symTable){
+		List<Integer> encoded = encode(toEncode, symTable);
+		System.out.println(toEncode + ": " + encoded);
+		String decoded = decode(encoded, symTable);
+		System.out.println((toEncode.equals(decoded) ? "" : "in") + "correctly decoded to " + decoded);
+	}
+	
+	public static void main(String[] args){
+		String symTable = "abcdefghijklmnopqrstuvwxyz";
+		test("broood", symTable);
+		test("bananaaa", symTable);
+		test("hiphophiphop", symTable);
+	}
+}