1 /* 2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot; 26 27 import java.lang.reflect.*; 28 29 public class HelloWorld { 30 private static String helloWorldString = "Hello, world!"; 31 private static volatile int helloWorldTrigger = 0; 32 private static final boolean useMethodInvoke = false; 33 private static Object lock = new Object(); 34 35 public static void main(String[] args) { 36 int foo = a(); 37 38 System.out.println("HelloWorld exiting. a() = " + foo); 39 } 40 41 private static int a() { 42 return 1 + b(); 43 } 44 45 private static int b() { 46 return 1 + c(); 47 } 48 49 private static int c() { 50 return 1 + d("Hi"); 51 } 52 53 private static int d(String x) { 54 System.out.println("HelloWorld.d() received \"" + x + "\" as argument"); 55 synchronized(lock) { 56 if (useMethodInvoke) { 57 try { 58 Method method = HelloWorld.class.getMethod("e", null); 59 Integer result = (Integer) method.invoke(null, new Object[0]); 60 return result.intValue(); 61 } 62 catch (Exception e) { 63 throw new RuntimeException(e.toString()); 64 } 65 } else { 66 67 int i = fib(10); // 89 68 long l = i; 69 float f = i; 70 double d = i; 71 char c = (char) i; 72 short s = (short) i; 73 byte b = (byte) i; 74 75 int ret = e(); 76 77 System.out.println("Tenth Fibonacci number in all formats: " + 78 i + ", " + 79 l + ", " + 80 f + ", " + 81 d + ", " + 82 c + ", " + 83 s + ", " + 84 b); 85 86 return ret; 87 } 88 } 89 } 90 91 public static int e() { 92 System.out.println("Going to sleep..."); 93 94 int i = 0; 95 96 while (helloWorldTrigger == 0) { 97 if (++i == 1000000) { 98 System.gc(); 99 } 100 } 101 102 System.out.println(helloWorldString); 103 104 while (helloWorldTrigger != 0) { 105 } 106 107 return i; 108 } 109 110 // Tree-recursive implementation for test 111 public static int fib(int n) { 112 if (n < 2) { 113 return 1; 114 } 115 return fib(n - 1) + fib(n - 2); 116 } 117 }