Java example source code file (Test7100757.java)

This example Java source code file (Test7100757.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bitset, nbits, random, string, test7100757, util

The Test7100757.java Java example source code

/*
 * Copyright (c) 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.
 *
 */

/**
 * @test
 * @bug 7100757
 * @summary The BitSet.nextSetBit() produces incorrect result in 32bit VM on Sparc
 *
 * @run main/timeout=300 Test7100757
 */

import java.util.*;

public class Test7100757 {

  public static final int NBITS = 256;

  public static void main(String[] args) {

    BitSet bs = new BitSet(NBITS);
    Random rnd = new Random();
    long[] ra = new long[(NBITS+63)/64];

    for(int l=0; l < 5000000; l++) {

      for(int r = 0; r < ra.length; r++) {
        ra[r] = rnd.nextLong();
      }
      test(ra, bs);
    }
  }

  static void test(long[] ra, BitSet bs) {
      bs.clear();
      int bits_set = 0;
      for(int i = 0, t = 0, b = 0; i < NBITS; i++) {
        long bit = 1L << b++;
        if((ra[t]&bit) != 0) {
          bs.set(i);
          bits_set++;
        }
        if(b == 64) {
          t++;
          b = 0;
        }
      }
      // Test Long.bitCount()
      int check_bits = bs.cardinality();
      if (check_bits != bits_set) {
        String bs_str = bs.toString();
        System.err.printf("cardinality bits: %d != %d  bs: %s\n", check_bits, bits_set, bs_str);
        System.exit(97);
      }
      // Test Long.numberOfTrailingZeros()
      check_bits = 0;
      for (int i = bs.nextSetBit(0); i >= 0; i = bs.nextSetBit(i+1)) {
        check_bits++;
      }
      if (check_bits != bits_set) {
        String bs_str = bs.toString();
        System.err.printf("nextSetBit bits: %d != %d  bs: %s\n", check_bits, bits_set, bs_str);
        System.exit(97);
      }
      // Test Long.numberOfLeadingZeros()
      for(int i = bs.length(); i > 0; i = bs.length()) {
        bs.clear(i-1);
      }
      // Test Long.bitCount()
      check_bits = bs.cardinality();
      if (check_bits != 0) {
        String bs_str = bs.toString();
        System.err.printf("after clear bits: %d != 0  bs: %s\n", check_bits, bs_str);
        System.exit(97);
      }
  }

};