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Task/Odd-word-problem/Java/odd-word-problem.java

@@ -0,0 +1,57 @@
+public class OddWord {
+    interface CharHandler {
+	CharHandler handle(char c) throws Exception;
+    }
+    final CharHandler fwd = new CharHandler() {
+	public CharHandler handle(char c) {
+	    System.out.print(c);
+	    return (Character.isLetter(c) ? fwd : rev);
+	}
+    };
+    class Reverser extends Thread implements CharHandler {
+	Reverser() {
+	    setDaemon(true);
+	    start();
+	}
+	private Character ch; // For inter-thread comms
+	private char recur() throws Exception {
+	    notify();
+	    while (ch == null) wait();
+	    char c = ch, ret = c;
+	    ch = null;
+	    if (Character.isLetter(c)) {
+		ret = recur();
+		System.out.print(c);
+	    }
+	    return ret;
+	}
+	public synchronized void run() {
+	    try {
+		while (true) {
+		    System.out.print(recur());
+		    notify();
+		}
+	    } catch (Exception e) {}
+	}
+	public synchronized CharHandler handle(char c) throws Exception {
+	    while (ch != null) wait();
+	    ch = c;
+	    notify();
+	    while (ch != null) wait();
+	    return (Character.isLetter(c) ? rev : fwd);
+	}
+    }
+    final CharHandler rev = new Reverser();
+
+    public void loop() throws Exception {
+	CharHandler handler = fwd;
+	int c;
+	while ((c = System.in.read()) >= 0) {
+	    handler = handler.handle((char) c);
+	}
+    }
+
+    public static void main(String[] args) throws Exception {
+	new OddWord().loop();
+    }
+}