1 /* 2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package vm.compiler.share; 24 25 public class Random { 26 private int current; 27 28 public Random(int init) { 29 this.current = init; 30 } 31 32 //big prime number 33 private static long BASE = 1003001; 34 35 public int nextInt() { 36 current = (int) ((long) current * current % BASE - 1); 37 return current; 38 } 39 40 public int nextInt(int n) { 41 return nextInt() % n; 42 } 43 44 45 /** 46 * for testing purposes 47 * @param args 48 */ 49 public static void main(String[] args) { 50 Random r = new Random(11); 51 int[] a = new int[100]; 52 53 for(int i=0; i<1000; i++) { 54 a[r.nextInt(100)]++; 55 } 56 57 for(int i=0; i<100; i++){ 58 System.out.println(times(a[i])); 59 } 60 61 } 62 63 public static String times(int n) { 64 StringBuilder sb = new StringBuilder(); 65 for(int i=0; i<n; i++) { 66 sb.append("*"); 67 } 68 return sb.toString(); 69 } 70 }