/*

 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

package sun.jvm.hotspot;

import java.lang.reflect.*;

public class HelloWorld {

  private static String helloWorldString = "Hello, world!";

  private static volatile int helloWorldTrigger = 0;

  private static final boolean useMethodInvoke = false;

  private static Object lock = new Object();

  public static void main(String[] args) {

    int foo = a();

    System.out.println("HelloWorld exiting. a() = " + foo);

  }

  private static int a() {

    return 1 + b();

  }

  private static int b() {

    return 1 + c();

  }

  private static int c() {

    return 1 + d("Hi");

  }

  private static int d(String x) {

    System.out.println("HelloWorld.d() received \"" + x + "\" as argument");

    synchronized(lock) {

      if (useMethodInvoke) {

        try {

          Method method = HelloWorld.class.getMethod("e");

          Integer result = (Integer) method.invoke(null, new Object[0]);

          return result.intValue();

        }

        catch (Exception e) {

          throw new RuntimeException(e.toString());

        }

      } else {

        int i = fib(10); // 89

        long l = i;

        float f = i;

        double d = i;

        char c = (char) i;

        short s = (short) i;

        byte b = (byte) i;

        int ret = e();

        System.out.println("Tenth Fibonacci number in all formats: " +

                           i + ", " +

                           l + ", " +

                           f + ", " +

                           d + ", " +

                           c + ", " +

                           s + ", " +

                           b);

        return ret;

      }

    }

  }

  public static int e() {

    System.out.println("Going to sleep...");

    int i = 0;

    while (helloWorldTrigger == 0) {

      if (++i == 1000000) {

        System.gc();

      }

    }

    System.out.println(helloWorldString);

    while (helloWorldTrigger != 0) {

    }

    return i;

  }

  // Tree-recursive implementation for test

  public static int fib(int n) {

    if (n < 2) {

      return 1;

    }

    return fib(n - 1) + fib(n - 2);

  }

}