Data commit

Task/Guess-the-number-With-feedback-player-/Java/guess-the-number-with-feedback-player-.java

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+import java.util.AbstractList;
+import java.util.Collections;
+import java.util.Scanner;
+
+public class GuessNumber {
+    public static final int LOWER = 0, UPPER = 100;
+    public static void main(String[] args) {
+	System.out.printf("Instructions:\n" +
+			  "Think of integer number from %d (inclusive) to %d (exclusive) and\n" +
+			  "I will guess it. After each guess, you respond with L, H, or C depending\n" +
+			  "on if my guess was too low, too high, or correct.\n",
+			  LOWER, UPPER);
+	int result = Collections.binarySearch(new AbstractList<Integer>() {
+		private final Scanner in = new Scanner(System.in);
+		public int size() { return UPPER - LOWER; }
+		public Integer get(int i) {
+		    System.out.printf("My guess is: %d. Is it too high, too low, or correct? (H/L/C) ", LOWER+i);
+		    String s = in.nextLine();
+		    assert s.length() > 0;
+		    switch (Character.toLowerCase(s.charAt(0))) {
+		    case 'l':
+			return -1;
+		    case 'h':
+			return 1;
+		    case 'c':
+			return 0;
+		    }
+		    return -1;
+		}
+	    }, 0);
+	if (result < 0)
+	    System.out.println("That is impossible.");
+	else
+	    System.out.printf("Your number is %d.\n", result);
+    }
+}